Consumer yielded rather than a task instance

[lsbardel]

This error occurs just before the test suite ends running tasks.

   raise pulsar.HaltServer(exit_code=exit_code)
pulsar.utils.exceptions.HaltServer: Exiting server.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
   File ".../pulsar/pulsar/async/futures.py", line 434, in _step
     result = coro.send(value)
  File ".../pulsar/pulsar/apps/tasks/backend.py", line 412, in _
    task_id = task['id']
TypeError: 'Consumer' object is not subscriptable