title: Celery Error when applying a task "'NoneType' object has no attribute 'top'"
body: <p>Since last week we are seeing a lot of errors on our production server,</p>
  <p>Specifically when calling Celery 4.47 (python 2.7) apply_async on tasks that were working for a long time,</p>
  <p>seems the request stack is null.</p>
  <pre><code>python2.7/site-packages/celery/app/task.py line 1023 in _get_request args locals
  req = self.request_stack.top
  AttributeError: 'NoneType' object has no attribute 'top'
  </code></pre>
  <p>Would appriciate your kind help</p>