def add_failure(self, task, exception):
        self.t_results[task.name].set_result('fail', exception.get_msg())
Preview content for a scribble which exists. See #34.
dataset/ETHPy150Open pydoit/doit/doit/reporter.py/JsonReporter.add_failure--crossover with--dataset/ETHPy150Open caktus/django-scribbler/scribbler/tests/test_views.py/PreviewTestCase.test_preview_existing