Comment 2 for bug 1478599

Reviewed: https://review.openstack.org/206131
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=54f97d28b04b996ed1c8e7fa15f1f4d8f3d58c50
Submitter: Jenkins
Branch: master

commit 54f97d28b04b996ed1c8e7fa15f1f4d8f3d58c50
Author: Tom Barron <email address hidden>
Date: Sat Jul 25 17:11:29 2015 -0400

    Fix cleanup_temp_volume_snapshots for missing vol

    The cleanup_temp_volume_snapshots method raises an exception that
    causes the backup service to exit if there is a backup without a
    corresponding volume.

    This commit catches these exceptions so that the backup service is
    not prevented from starting in this circumstance.

    Change-Id: Ia1aac2fe78048df5fce595d5de181cb4930ea78d
    Closes-bug: 1478599