def __init__(self, to_notify=None):
        AbstractResultCollector.__init__(self, to_notify)
        self._cond = threading.Condition()
        self._collection = []
        self._expected = 0
\param to_notify ApplyResult object to notify when all the
dataset/ETHPy150Open serverdensity/sd-agent/checks/libs/thread_pool.py/UnorderedResultCollector.__init__