[1.0.X] Fixed #10082 -- Modified BaseFormSet so that ordering checks work when...

[1.0.X] Fixed #10082 -- Modified BaseFormSet so that ordering checks work when the formset is empty. Thanks to Petr Marhoun for the report and test case, and bmathieu for the fix.

Merge of r10643 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10644 bcc190cf-cafb-0310-a4f2-bffc1f526a37