Add query for testtools AttributeError bug 1362909

Sounds like this might already be fixed shortly
after a new testtools release introduced the bug,
so just pushing this up to get it off the
uncategorized bugs page and for anyone looking
for the thing to recheck against.

Change-Id: Idb63c6ad1e845b639a62865094f8ceb5a59ec8cb
Related-Bug: #1362909