Fixed #9255: Removed now-obsolete warning about the old semantics of __exact=None vs. __isnull=True
Fixed #9255: Removed now-obsolete warning about the old semantics of __exact=None vs. __isnull=True


git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@9105 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django