test_get_network_status fails

test_get_network_status fails intermittently with output like...

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ERROR: test_get_network_status
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Traceback:
  File "/home/neena/code/stem/test/integ/control/controller.py", line 525, in test_get_network_status
    self.assertEqual(first_descriptor, controller.get_network_status(first_descriptor.fingerprint))
  File "/home/neena/code/stem/stem/control.py", line 723, in get_network_status
    desc_content = self.get_info(query)
  File "/home/neena/code/stem/stem/control.py", line 635, in get_info
    if default == UNDEFINED: raise exc
InvalidArguments: GETINFO request contained unrecognized keywords: ns/id/0013D22389CD50D0B784A3E4061CB31E8CE8CEB5


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Ran 19 tests in 0.280s

FAILED

Shutting down tor... done
TESTING FAILED (14 seconds)
  [RUN_OPEN] test_get_network_status (test.integ.control.controller.TestController) ... ERROR