Comment 2 for bug 1428342

Reviewed: https://review.openstack.org/161438
Committed: https://git.openstack.org/cgit/stackforge/python-openstacksdk/commit/?id=ea01e73948b20a49e452c11c3f4a628631df1dd9
Submitter: Jenkins
Branch: master

commit ea01e73948b20a49e452c11c3f4a628631df1dd9
Author: Brian Curtin <email address hidden>
Date: Wed Mar 4 15:57:49 2015 -0600

    Catch AttributeError in header with no alias

    Now that resource.header is a thing and it's populated with the headers
    from a requests.Response, which is a
    requests.structures.CaseInsensitiveDict, we have to take an extra step
    to make sure we don't try and convert a None-alias to lower case.

    Change-Id: I47704191d1822d468389986c5ab203781af59074
    Closes-Bug: 1428342