remove pipeline._pipeline_released

	_pipeline_released produces regression in PipelineDeveloperView.release_pipeline()

Author: servoz

capsul/pipeline/pipeline.py

@@ -226,7 +226,6 @@ def __init__(self, autoexport_nodes_parameters=None, **kwargs):
 
         # Class attributes
         # this one is only useful to maintain subprocesses/subpipelines life
-        self._pipeline_released = False
         self.list_process_in_pipeline = []
         self.nodes_activation = Controller()
         self.nodes = SortedDictionary()

capsul/qt_gui/widgets/pipeline_developer_view.py

@@ -2820,11 +2820,6 @@ def release_pipeline(self, delete=False):
 
             if pipeline is not None:
 
-                if getattr(pipeline, '_pipeline_released', False):
-                    return  # pipeline already released
-        
-                pipeline._pipeline_released = True
-
                 if hasattr(pipeline, 'pipeline_steps'):
                     pipeline.pipeline_steps.on_trait_change(
                         self._reset_pipeline, remove=True