Deletes a dataset (and optionally any tables in it), if it exists.

           :param dataset:
           :type dataset: BQDataset
           :param delete_nonempty: if true, will delete any tables before deleting the dataset

def delete_dataset(self, dataset, delete_nonempty=True):
        """Deletes a dataset (and optionally any tables in it), if it exists.

           :param dataset:
           :type dataset: BQDataset
           :param delete_nonempty: if true, will delete any tables before deleting the dataset
        """

        if not self.dataset_exists(dataset):
            return

        self.client.datasets().delete(projectId=dataset.project_id,
                                      datasetId=dataset.dataset_id,
                                      deleteContents=delete_nonempty).execute()