Updated openstack/openstack
Project: openstack/horizon  449c36c9873438ca4d493cee4cc2146c66350f8e

Fix backup details with missing volumes

Backup details page should still load even if the associated
volume has been deleted.

Change-Id: Ifa89382c4638ec5ca16c9a8a18c96afd9a4efe72
Closes-bug: 1356035