don't match on empty lines (bug 763763)

apps/access/models.py

@@ -23,6 +23,9 @@ class AccessWhitelist(amo.models.ModelBase):
         """Loop through whitelist and find any matches."""
         for w in AccessWhitelist.objects.all():
             for e in w.email.replace('\r', '').split('\n'):
+                e = e.strip()
+                if not e:
+                    continue
                 # Asterisks become .+ so that we can match wildcards.
                 if re.match(re.escape(e).replace('\\*', '.+'), email):
                     return True

apps/access/tests.py

@@ -249,3 +249,9 @@ class TestAccessWhitelist(amo.tests.TestCase):
         with self.assertNumQueries(1):
             # Exit post-save.
             AccessWhitelist.objects.create(email='')
+
+    def test_empty(self):
+        for value in ['', ' ']:
+            AccessWhitelist.objects.all().delete()
+            AccessWhitelist.objects.create(email=value)
+            eq_(AccessWhitelist.matches('any@email.com'), False)