Broken volume creation when not passing options

[f-sommerauer]

When calling cli.CreateVolume(ctx, volName, "local", nil, nil) on the containerz client the resulting volume will have invalid local mount options set, leading to the following configuration:

sudo docker volume inspect some-volume
[
    {
        "CreatedAt": "2026-02-27T16:58:25Z",
        "Driver": "local",
        "Labels": null,
        "Mountpoint": "/var/lib/docker/volumes/some-volume/_data",
        "Name": "some-volume",
        "Options": {
            "device": "",
            "o": "",
            "type": "none"
        },
        "Scope": "local"
    }
]

This results in the following error once the volume is used within a StartContainer command:
Error response from daemon: missing device in volume options

Potential solution (not tested):
Set LocalMountOptions of cpb.CreateVolumeRequest_LocalMountOptions to nil unless at least one options parameter is passed to the client.
Not setting the "device" option unless the "mountpoint" option is set may work as well.