test suite fails when assertions are disabled

[Burcin Erocal]

$ python -OO setup.py nosetests
running nosetests
running egg_info
writing requirements to lazyflow.egg-info/requires.txt
writing lazyflow.egg-info/PKG-INFO
writing top-level names to lazyflow.egg-info/top_level.txt
writing dependency_links to lazyflow.egg-info/dependency_links.txt
reading manifest file 'lazyflow.egg-info/SOURCES.txt'
writing manifest file 'lazyflow.egg-info/SOURCES.txt'
running build_ext
No handlers could be found for logger "lazyflow.operators.opDetectMissingData"
.Exception in thread Worker #9:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 808, in __bootstrap_inner
    self.run()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/threadPool.py", line 171, in run
    next_task()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 307, in __call__
    self._switch_to()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 298, in _switch_to
    self.greenlet.switch()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 258, in _execute
    self._sig_finished(self._result)
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 57, in __call__
    f(*args, **kwargs)
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/utility/roiRequestBatch.py", line 185, in _handleCompletedRequest
    self.resultSignal(roi, result)
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/utility/orderedSignal.py", line 68, in __call__
    f(*args, **kw)
  File "/home/burcin/hci/vanilla/lazyflow/tests/testBigRequestStreamer.py", line 52, in handleResult
    resultslock.release()
error: release unlocked lock

Exception in thread Worker #4:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 808, in __bootstrap_inner
    self.run()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/threadPool.py", line 171, in run
    next_task()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 307, in __call__
    self._switch_to()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 298, in _switch_to
    self.greenlet.switch()
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 258, in _execute
    self._sig_finished(self._result)
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/request/request.py", line 57, in __call__
    f(*args, **kwargs)
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/utility/roiRequestBatch.py", line 185, in _handleCompletedRequest
    self.resultSignal(roi, result)
  File "/home/burcin/hci/vanilla/lazyflow/lazyflow/utility/orderedSignal.py", line 68, in __call__
    f(*args, **kw)
  File "/home/burcin/hci/vanilla/lazyflow/tests/testBigRequestStreamer.py", line 52, in handleResult
    resultslock.release()
error: release unlocked lock