@gen.coroutine
  def _Notify(self):
    yield NotificationManager.NotifyRemoveViewpoint(self._client, self._user_id, self._viewpoint_id)
Return 403 if user does not have permissions to preview scribbles.
dataset/ETHPy150Open viewfinderco/viewfinder/backend/op/remove_viewpoint_op.py/RemoveViewpointOperation._Notify--crossover with--dataset/ETHPy150Open caktus/django-scribbler/scribbler/tests/test_views.py/PreviewTestCase.test_permission_required