Comment 1 for bug 1610073

Whether the volume without volume type is supported by Cinder? The exception message "volume_type cannot be None" confused me. Waiting for this issue to be triaged.

Seems to me, this is valid case, and it is supported for a long time. If the cinder doesn't want to support this case anymore, it should failed in the Cinder-API instead of Cinder Scheduler.

Also, I have checked the change log, this behavior is introduced in change: L750
https://review.openstack.org/#/c/246600/43/cinder/volume/flows/api/create_volume.py