Fixed #3281 -- newforms: URLField now works properly with required=False and verify_exists=True together. Thanks, zendak

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4313 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/newforms/fields.py

@@ -288,6 +288,8 @@ class URLField(RegexField):
 
     def clean(self, value):
         value = RegexField.clean(self, value)
+        if not self.required and value == u'':
+            return value
         if self.verify_exists:
             import urllib2
             from django.conf import settings