def get_image(self):
        if self.image:
            return self.image
        return None
date_based.object_detail can view a page in the past
dataset/ETHPy150Open diefenbach/django-lfs/lfs/manufacturer/models.py/Manufacturer.get_image--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/tests/regressiontests/views/tests/generic/date_based.py/ObjectDetailTest.test_finds_past