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


git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@12310 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django