Fixed #7597 -- Added code to force the re-opening of the cursor connection,...

Fixed #7597 -- Added code to force the re-opening of the cursor connection, just in case a post-syncdb handler closes it. Thanks to keithb for the report and fix.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7889 bcc190cf-cafb-0310-a4f2-bffc1f526a37