Don't translate exceptions w/ no message
Don't translate exceptions w/ no message

These messages only contain variable references,
so there is nothing to translate.

Change-Id: I9ab60227938bdaa09cbf8fc97e1aff2845ecb49e

openstack/cinder,openstack/cinder,j-griffith/cinder,phenoxim/cinder,phenoxim/cinder,mahak/cinder,eharney/cinder,mahak/cinder,Datera/cinder,ge0rgi/cinder,j-griffith/cinder,Datera/cinder,eharney/cinder