Gitlab can return None for avatar blocks

Because reasons!

buildtrigger/test/test_gitlabhandler.py

@@ -1,7 +1,9 @@
 import json
 import pytest
 
-from buildtrigger.test.gitlabmock import get_gitlab_trigger
+from mock import Mock
+
+from buildtrigger.test.gitlabmock import get_gitlab_trigger, get_mock_gitlab
 from buildtrigger.triggerutil import (SkipRequestException, ValidationRequestException,
                                       InvalidPayloadException)
 from endpoints.building import PreparedBuild
@@ -35,6 +37,21 @@ def test_lookup_user(email, expected_response, gitlab_trigger):
   assert gitlab_trigger.lookup_user(email) == expected_response
 
 
+def test_null_avatar(gitlab_trigger):
+  gitlab_trigger._get_authorized_client = get_mock_gitlab(with_nullavatar=True)
+  namespace_data = gitlab_trigger.list_build_source_namespaces()
+  expected = {
+    'avatar_url': None,
+    'personal': False,
+    'title': 'someorg',
+    'url': 'https://bitbucket.org/someorg',
+    'score': 1,
+    'id': 'someorg',
+  }
+
+  assert namespace_data == [expected]
+
+
 @pytest.mark.parametrize('payload, expected_error, expected_message', [
   ('{}', InvalidPayloadException, ''),