Moved the test added in r15504 to a different case where it doesn't actually...

Moved the test added in r15504 to a different case where it doesn't actually verify the existence of the URL by calling urlopen but only validates it.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15551 bcc190cf-cafb-0310-a4f2-bffc1f526a37