Add true/false logic to fulfill_reward

ownchatbot/reward_handlers.py

@@ -255,6 +255,7 @@ def fulfill_reward(db, reward_id):  # Mark a reward as fulfilled in the database
             (reward_id,)
         )
         db.commit()
+        return True
     except Error as frerror:
         current_app.logger.error(f'Couldn\'t  fulfill reward id {reward_id}: {frerror.args[0]}')
         return False