Comment 3 for bug 1481681

Reviewed: https://review.fuel-infra.org/10790
Submitter: Vitaly Sedelnik <email address hidden>
Branch: openstack-ci/fuel-6.0-updates/2014.2

Commit: a476f95a1f7caa5c9bcf7d98d74062b77616e48d
Author: Alex Ermolov <email address hidden>
Date: Tue Sep 1 07:55:47 2015

Fixes attribute content checking

Use proper way to check the volume attribute contents in display_name
and display_description. If they are not empty, translate them to
volume backend description. Modify other places where return empty
string makes sense than None as well as the return value checking.

Closes-Bug: #1481681
Change-Id: I87b8d09baf75b227b479f8a79ace90a85cf84177