Comment 75 for bug 1559072

Submitter: Zuul
Branch: master

commit 0b28b04ebbfaed981f4e00e69e4c7a8e0ed75395
Author: Zhao Chao <email address hidden>
Date: Tue Feb 6 15:31:42 2018 +0800

    Handle error response for webob>=1.6.0

    WebOb change changed
    the way in which the error response body is formatted such that
    it's no longer a nested dict. So we have to handle both the
    old convention of an error message key to the response body error
    dict and the new way with just the error body dict.

    This was reported upstream:

    But given this was apparently implemented as a long-overdue change
    in WebOb the behavior is not likely to change.

    Change-Id: Id8bfde6277640de48768bbe5a5e4252b97253ed2
    Closes-Bug: #1559072
    Co-Authored-By: Matt Riedemann <email address hidden>
    Signed-off-by: Zhao Chao <email address hidden>