def __bool__( self ):
        return self() is not None
Get the number of reminder events that were missed on registration day.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/dispatch/saferef.py/BoundMethodWeakref.__bool__--crossover with--dataset/ETHPy150Open dimagi/commcare-hq/custom/fri/api.py/get_num_missed_windows