def signin_view(*args, **kwargs):
    return FlowBuilder(ModernSignin, args, kwargs)
thumbnail_url_if_set() returns self.thumbnail if set, or else
dataset/ETHPy150Open idlesign/django-sitegate/sitegate/decorators.py/signin_view--crossover with--dataset/ETHPy150Open mozilla/kitsune/kitsune/gallery/tests/test_models.py/ImageTestCase.test_thumbnail_url_if_set