def has_nulls(self):
        return True if None in self else False
A bug prevented events without start date to throw a 404.
dataset/ETHPy150Open wireservice/csvkit/csvkit/table.py/Column.has_nulls--crossover with--dataset/ETHPy150Open swcarpentry/amy/workshops/test/test_event.py/TestEventViews.test_display_of_event_without_start_date