def complex_filter(self, filter_obj):
        return self
we need installed nose plugin
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/models/query.py/EmptyQuerySet.complex_filter--crossover with--dataset/ETHPy150Open Blazemeter/taurus/bzt/modules/selenium.py/NoseTester.run_checklist