Fixed super-edge-case bug in debug view where exc_value.args was empty. I...

Fixed super-edge-case bug in debug view where exc_value.args was empty. I managed to trigger this in some template code

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17245 bcc190cf-cafb-0310-a4f2-bffc1f526a37