Added the actual assertFormError changes, accidentally omitted from [5181].
Added the actual assertFormError changes, accidentally omitted from [5181].

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%405182

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel