Comment 3 for bug 1327397

Reviewed: https://review.openstack.org/100024
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=08201764d1500a4bff5db91228659a2c4063b808
Submitter: Jenkins
Branch: master

commit 08201764d1500a4bff5db91228659a2c4063b808
Author: Joe Gordon <email address hidden>
Date: Fri Jun 13 14:46:37 2014 -0700

    Skip migrations test_walk_versions instead of pass

    When there is no db engine configured for the migration tests,
    the test_walk_versions test was passing, rather than skipping,
    because it contained a for-loop and no check for the length of the
    sequence being iterated over.
    This patch checks the length of the configured engines and
    properly skips the test when there are no engines.

    Change-Id: I4078655f01638c22cf029f088018b8be93d6a01a
    Co-Authored-By: Devananda van der Veen<email address hidden>
    Closes-bug: #1327397