[1.0.X] Fixed a pair of bugs in determining the set of models to flush that...

[1.0.X] Fixed a pair of bugs in determining the set of models to flush that were causing test cause failures in Oracle after [9536].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9547 bcc190cf-cafb-0310-a4f2-bffc1f526a37