[1.2.X] Fixed #14014 -- Ensure that the "save and add another" button for...

[1.2.X] Fixed #14014 -- Ensure that the "save and add another" button for users actually does what it says. Thanks to Ramiro for the report.

Backport of r13503 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13504 bcc190cf-cafb-0310-a4f2-bffc1f526a37