Fixed #12605 -- Removed redundant import of `ImproperlyConfigured`.  Thanks, tmcw.
Fixed #12605 -- Removed redundant import of `ImproperlyConfigured`.  Thanks, tmcw.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%4012310

Belgabor/django,Belgabor/django,Belgabor/django