title: How do I set the Application Id in appengine?
body: <p>I'm using Django along with appengine. When I try to save a record, I'm getting the error
  "app_id must not be empty". The application name has been set in app.yaml. I also added
  os.environ['APPLICATION_ID'] = 'test' in main.py. However, I continue to get the same error.</p>