[1.1.X] Fixed #11681. Fixed display of non_field_errors and non_form_errors in...

[1.1.X] Fixed #11681. Fixed display of non_field_errors and non_form_errors in the admin. Backport of r12541 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12542 bcc190cf-cafb-0310-a4f2-bffc1f526a37