Before you had to restart runserver for the correct exception message to show
up again. Reverts fix in r9680 which has this side-affect.
Thanks to jarrow, carljm and ramiro for their work on the patch and tickets.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@12956 bcc190cf-cafb-0310-a4f2-bffc1f526a37