def fail(self, error):
        self._deferred.errback(error)
If no data, report should contain header row only.
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/protocols/memcache.py/Command.fail--crossover with--dataset/ETHPy150Open caktus/django-timepiece/timepiece/reports/tests/test_productivity.py/TestProductivityReport.test_no_data