mozilla/kitsune — pull request #1854 by willkg (2014-03-06 01:56:56+00:00)
Title: [bug 979434] Fix _check_username

The argument passed into _check_username can sometimes be None because
it's coming out of cleaned_data, but wasn't valid. Because of that,
username_allowed returns False and then everything goes to straight to
hell.

This commit fixes that.

r?