Comment 1 for bug 1517763

Error is suppressed when commeting out the metadata line in the dict at /usr/lib/python2.7/dist-packages/cinder/volume/utils.py line 75.
So this should be an issue with the sqlalchemy query which is incorrect or some value checking is wrong since my volumes dont have any volume_metadata entries in the database.

I don't know what impact removing this line has.