Anything can be None in GitLab!

Fixes a problem where the `project_access` block is reported as `null` from GitLab API, which breaks our code, because we assume sanity in API design.

buildtrigger/test/gitlabmock.py

@@ -27,6 +27,13 @@ def get_currentuser_mock():
   }
 
 def project(namespace, name, is_org=False):
+  project_access = None
+
+  if namespace == 'knownuser':
+    project_access = {
+      'access_level': 50,
+    }
+
   data = {
     'id': '%s/%s' % (namespace, name),
     'default_branch': 'master',
@@ -43,9 +50,7 @@ def project(namespace, name, is_org=False):
     'ssh_url_to_repo': 'git://%s/%s' % (namespace, name),
     'public': name != 'somerepo',
     'permissions': {
-      'project_access': {
-        'access_level': 50 if namespace == 'knownuser' else 0,
-      }
+      'project_access': project_access,
     },
     'owner': {
       'avatar_url': 'avatarurl',