[Bug] 0.10.1版本多模态大模型请求报文中未送任何text提示词时会直接报错。0.10.2版本也未解决。

### Checklist

- [ ] 1. I have searched related issues but cannot get the expected help.
- [x] 2. The bug has not been fixed in the latest version.
- [ ] 3. Please note that if the bug-related issue you submitted lacks corresponding environment info and a minimal reproducible demo, it will be challenging for us to reproduce and resolve the issue, reducing the likelihood of receiving feedback.

### Describe the bug

0.10.1版本多模态大模型请求报文中未送任何text提示词时会直接报错，应该兼容下为空仍会送空字符给大模型。

### Reproduction

docker run -d --name lmdeploy_Qwen2.5-VL-32B-Instruct \
    --runtime=nvidia --gpus "device=0" \
    -v /home/devuser/models/other-models:/root/model \
    -p 8015:23333 \
    --ipc=host \
    harbor.bhidi.com/ai/lmdeploy:0.10.1-long-cuda118-fixed1 \
    sh -c "pip install qwen_vl_utils && \
           lmdeploy serve api_server /root/model/Qwen2.5-VL-32B-Instruct-AWQ \
           --model-name Qwen2.5-VL-32B-Instruct-AWQ \
           --session-len 120000 \
           --cache-max-entry-count 0.8 \
           --max-batch-size 4 \
		   --backend turbomind \
           --enable-dynamic-compression \
           --importance-threshold 0.6 \
           --min-compression-ratio 0.5 \
           --max-compression-ratio 0.8 \
           --segment-strategy paragraph"

### Environment

```Shell
sys.platform: linux
Python: 3.10.12 (main, Aug 15 2025, 14:32:43) [GCC 11.4.0]
CUDA available: True
MUSA available: False
numpy_random_seed: 2147483648
GPU 0: NVIDIA GeForce RTX 4090
CUDA_HOME: /usr/local/cuda
NVCC: Cuda compilation tools, release 11.8, V11.8.89
GCC: x86_64-linux-gnu-gcc (Ubuntu 11.4.0-1ubuntu1~22.04.2) 11.4.0
PyTorch: 2.6.0+cu118
PyTorch compiling details: PyTorch built with:
  - GCC 9.3
  - C++ Version: 201703
  - Intel(R) oneAPI Math Kernel Library Version 2024.2-Product Build 20240605 for Intel(R) 64 architecture applications
  - Intel(R) MKL-DNN v3.5.3 (Git Hash 66f0cb9eb66affd2da3bf5f8d897376f04aae6af)
  - OpenMP 201511 (a.k.a. OpenMP 4.5)
  - LAPACK is enabled (usually provided by MKL)
  - NNPACK is enabled
  - CPU capability usage: AVX512
  - CUDA Runtime 11.8
  - NVCC architecture flags: -gencode;arch=compute_50,code=sm_50;-gencode;arch=compute_60,code=sm_60;-gencode;arch=compute_70,code=sm_70;-gencode;arch=compute_75,code=sm_75;-gencode;arch=compute_80,code=sm_80;-gencode;arch=compute_86,code=sm_86;-gencode;arch=compute_37,code=sm_37;-gencode;arch=compute_90,code=sm_90
  - CuDNN 90.1
  - Magma 2.6.1
  - Build settings: BLAS_INFO=mkl, BUILD_TYPE=Release, COMMIT_SHA=2236df1770800ffea5697b11b0bb0d910b2e59e1, CUDA_VERSION=11.8, CUDNN_VERSION=9.1.0, CXX_COMPILER=/opt/rh/devtoolset-9/root/usr/bin/c++, CXX_FLAGS= -D_GLIBCXX_USE_CXX11_ABI=0 -fabi-version=11 -fvisibility-inlines-hidden -DUSE_PTHREADPOOL -DNDEBUG -DUSE_KINETO -DLIBKINETO_NOROCTRACER -DLIBKINETO_NOXPUPTI=ON -DUSE_FBGEMM -DUSE_PYTORCH_QNNPACK -DUSE_XNNPACK -DSYMBOLICATE_MOBILE_DEBUG_HANDLE -O2 -fPIC -Wall -Wextra -Werror=return-type -Werror=non-virtual-dtor -Werror=bool-operation -Wnarrowing -Wno-missing-field-initializers -Wno-type-limits -Wno-array-bounds -Wno-unknown-pragmas -Wno-unused-parameter -Wno-strict-overflow -Wno-strict-aliasing -Wno-stringop-overflow -Wsuggest-override -Wno-psabi -Wno-error=old-style-cast -Wno-missing-braces -fdiagnostics-color=always -faligned-new -Wno-unused-but-set-variable -Wno-maybe-uninitialized -fno-math-errno -fno-trapping-math -Werror=format -Wno-stringop-overflow, LAPACK_INFO=mkl, PERF_WITH_AVX=1, PERF_WITH_AVX2=1, TORCH_VERSION=2.6.0, USE_CUDA=ON, USE_CUDNN=ON, USE_CUSPARSELT=1, USE_EXCEPTION_PTR=1, USE_GFLAGS=OFF, USE_GLOG=OFF, USE_GLOO=ON, USE_MKL=ON, USE_MKLDNN=ON, USE_MPI=OFF, USE_NCCL=1, USE_NNPACK=ON, USE_OPENMP=ON, USE_ROCM=OFF, USE_ROCM_KERNEL_ASSERT=OFF, 

TorchVision: 0.21.0+cu118
LMDeploy: 0.10.1+
transformers: 4.56.1
fastapi: 0.121.3
pydantic: 2.12.4
triton: 3.2.0
NVIDIA Topology: 
	GPU0	CPU Affinity	NUMA Affinity	GPU NUMA ID
GPU0	 X 	0-15	0		N/A

Legend:

  X    = Self
  SYS  = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
  NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
  PHB  = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
  PXB  = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
  PIX  = Connection traversing at most a single PCIe bridge
  NV#  = Connection traversing a bonded set of # NVLinks
```

### Error traceback

```Shell
ERROR:    Exception in ASGI application

+ Exception Group Traceback (most recent call last):

|   File "/opt/py3/lib/python3.10/site-packages/starlette/_utils.py", line 79, in collapse_excgroups

|     yield

|   File "/opt/py3/lib/python3.10/site-packages/starlette/responses.py", line 270, in __call__

|     async with anyio.create_task_group() as task_group:

|   File "/opt/py3/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 781, in __aexit__

|     raise BaseExceptionGroup(

| exceptiongroup.ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)

+-+---------------- 1 ----------------

| Traceback (most recent call last):

|   File "/opt/py3/lib/python3.10/site-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi

|     result = await app(  # type: ignore[func-returns-value]

|   File "/opt/py3/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__

|     return await self.app(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/fastapi/applications.py", line 1134, in __call__

|     await super().__call__(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/applications.py", line 107, in __call__

|     await self.middleware_stack(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/middleware/errors.py", line 186, in __call__

|     raise exc

|   File "/opt/py3/lib/python3.10/site-packages/starlette/middleware/errors.py", line 164, in __call__

|     await self.app(scope, receive, _send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/middleware/cors.py", line 85, in __call__

|     await self.app(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 63, in __call__

|     await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app

|     raise exc

|   File "/opt/py3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app

|     await app(scope, receive, sender)

|   File "/opt/py3/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__

|     await self.app(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/routing.py", line 716, in __call__

|     await self.middleware_stack(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/routing.py", line 736, in app

|     await route.handle(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/routing.py", line 290, in handle

|     await self.app(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/fastapi/routing.py", line 125, in app

|     await wrap_app_handling_exceptions(app, request)(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app

|     raise exc

|   File "/opt/py3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app

|     await app(scope, receive, sender)

|   File "/opt/py3/lib/python3.10/site-packages/fastapi/routing.py", line 112, in app

|     await response(scope, receive, send)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/responses.py", line 269, in __call__

|     with collapse_excgroups():

|   File "/usr/lib/python3.10/contextlib.py", line 153, in __exit__

|     self.gen.throw(typ, value, traceback)

|   File "/opt/py3/lib/python3.10/site-packages/starlette/_utils.py", line 85, in collapse_excgroups

|     raise exc

|   File "/opt/py3/lib/python3.10/site-packages/starlette/responses.py", line 273, in wrap

|     await func()

|   File "/opt/py3/lib/python3.10/site-packages/starlette/responses.py", line 253, in stream_response

|     async for chunk in self.body_iterator:

|   File "/opt/py3/lib/python3.10/site-packages/lmdeploy/serve/openai/api_server.py", line 489, in completion_stream_generator

|     async for res in result_generator:

|   File "/opt/py3/lib/python3.10/site-packages/lmdeploy/serve/async_engine.py", line 765, in generate

|     prompt_input = await self._get_prompt_input(prompt,

|   File "/opt/py3/lib/python3.10/site-packages/lmdeploy/serve/vl_async_engine.py", line 99, in _get_prompt_input

|     results = await self.vl_encoder.wrap_for_turbomind(results,

|   File "/opt/py3/lib/python3.10/site-packages/lmdeploy/vl/engine.py", line 124, in wrap_for_turbomind

|     result = self.model.to_turbomind(messages,

|   File "/opt/py3/lib/python3.10/site-packages/lmdeploy/vl/model/qwen2.py", line 186, in to_turbomind

|     prompt, IMAGE_TOKEN = self.proc_messages(messages, chat_template, sequence_start)

|   File "/opt/py3/lib/python3.10/site-packages/lmdeploy/vl/model/qwen2.py", line 140, in proc_messages

|     prompt = content[0]

| IndexError: list index out of range
```

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[Bug] 0.10.1版本多模态大模型请求报文中未送任何text提示词时会直接报错。0.10.2版本也未解决。 #4145

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[Bug] 0.10.1版本多模态大模型请求报文中未送任何text提示词时会直接报错。0.10.2版本也未解决。 #4145

Description

Checklist

Describe the bug

Reproduction

Environment

Error traceback

Metadata

Metadata

Assignees

Labels

Type

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Development

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