Add test case for committees without any address

This completes the XOR check; either a verbatim address or a list

website/activemembers/tests.py

@@ -185,12 +185,17 @@ class CommitteeMailingListTest(TestCase):
 
         self.testcie2.full_clean()
 
-    def test_no_emailaddress(self):
+    def test_exactly_one_address(self):
         with self.assertRaises(ValidationError):
             self.testcie1.contact_mailinglist = self.mailtest1
             self.testcie1.contact_email = "test@test.com"
             self.testcie1.full_clean()
 
+        with self.assertRaises(ValidationError):
+            self.testcie1.contact_mailinglist = None
+            self.testcie1.contact_email = None
+            self.testcie1.full_clean()
+
         self.testcie1.contact_mailinglist = self.mailtest1
         self.testcie1.contact_email = None
         self.testcie1.full_clean()