Fix NPE bug in RAC worker

We need to return `None`, not `0` if there are no additional repositories to measure

data/model/repositoryactioncount.py

@@ -41,7 +41,7 @@ def find_uncounted_repository():
                 .order_by(db_random_func()).get())
     return to_count
   except Repository.DoesNotExist:
-    return 0
+    return None
 
 
 def count_repository_actions(to_count):

workers/repositoryactioncounter.py

@@ -19,21 +19,22 @@ class RepositoryActionCountWorker(Worker):
     to_count = model.repositoryactioncount.find_uncounted_repository()
     if to_count is None:
       logger.debug('No further repositories to count')
-      return
+      return False
 
     logger.debug('Found repository #%s to count', to_count.id)
     was_counted = model.repositoryactioncount.count_repository_actions(to_count)
     if not was_counted:
       logger.debug('Repository #%s was counted by another worker', to_count.id)
-      return
+      return False
 
     logger.debug('Updating search score for repository #%s', to_count.id)
     was_updated = model.repositoryactioncount.update_repository_score(to_count)
     if not was_updated:
       logger.debug('Repository #%s had its search score updated by another worker', to_count.id)
-      return
+      return False
 
     logger.debug('Repository #%s search score updated', to_count.id)
+    return True
 
 if __name__ == "__main__":
   worker = RepositoryActionCountWorker()

workers/test/test_repositoryactioncounter.py

@@ -7,4 +7,7 @@ def test_repositoryactioncount(app):
   database.RepositorySearchScore.delete().execute()
 
   rac = RepositoryActionCountWorker()
-  rac._count_repository_actions()
+  while rac._count_repository_actions():
+    continue
+
+