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ERROR: test_timeout (test_motor_client.MotorClientTest)
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Traceback (most recent call last):
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/testing.py", line 427, in wrapper
    functools.partial(f, self), timeout=timeout)
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/ioloop.py", line 389, in run_sync
    return future_cell[0].result()
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/concurrent.py", line 129, in result
    raise_exc_info(self.__exc_info)
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/gen.py", line 206, in handle_exception
    if runner is not None and runner.handle_exception(typ, value, tb):
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/gen.py", line 580, in handle_exception
    self.run()
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/gen.py", line 529, in run
    yielded = self.gen.throw(*exc_info)
  File "/Users/emptysquare/.virtualenvs/motor/motor/test/test_motor_client.py", line 120, in test_timeout
    yield [timeout_fut, notimeout_fut]
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/stack_context.py", line 343, in _handle_exception
    if tail.exit(*exc):
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/stack_context.py", line 186, in exit
    return self.exception_handler(type, value, traceback)
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/gen.py", line 210, in handle_exception
    future.set_exc_info((typ, value, tb))
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/concurrent.py", line 125, in set_exc_info
    self.set_exception(exc_info[1])
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/concurrent.py", line 87, in set_exception
    self._set_done()
  File "/Users/emptysquare/.virtualenvs/motor/motor/.tox/tornado3-py26/lib/python2.6/site-packages/tornado/concurrent.py", line 95, in _set_done
    for cb in self._callbacks:
TypeError: 'NoneType' object is not iterable