I guess this is low priority since control_location is required for an encryption type in cinder:
https://github.com/openstack/cinder/blob/master/cinder/api/contrib/volume_type_encryption.py#L62
https://github.com/openstack/cinder/blob/master/cinder/api/contrib/volume_type_encryption.py#L70
So we wouldn't really hit this case anyway, but we are checking for it in the nova code.
I guess this is low priority since control_location is required for an encryption type in cinder:
https:/ /github. com/openstack/ cinder/ blob/master/ cinder/ api/contrib/ volume_ type_encryption .py#L62
https:/ /github. com/openstack/ cinder/ blob/master/ cinder/ api/contrib/ volume_ type_encryption .py#L70
So we wouldn't really hit this case anyway, but we are checking for it in the nova code.