Fix the errors raised when None is passed to template filters (#25593)
Fix the errors raised when None is passed to template filters (#25593)


apache/airflow,cfei18/incubator-airflow,apache/airflow,apache/airflow,nathanielvarona/airflow,apache/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow