Clear output of one climate variable

def clear(self):
        """Clear output of one climate variable
        """
        # mark this task as incomplete
        self.mark_incomplete()

        # Delete the indicator metadata, this also deletes values by cascading.
        for suffix in list(CLIMATE_SEASON_SUFFIXES.values()):
            try:
                # noinspection PyUnresolvedReferences
                indicator = self.session.query(models.ClimateIndicator) \
                    .filter(models.ClimateIndicator.description == self.description + suffix) \
                    .one()
                self.session.delete(indicator)
            except NoResultFound:
                # Data didn't exist yet, no problem
                pass

        self.close_session()