### Apache Airflow version

2.5.1

### What happened

/calendar page give a problem, here is the capture



![屏幕截图 2023-01-30 093116](https://user-images.githubusercontent.com/19165258/215369479-9fc7de5c-f190-460c-9cf7-9ab27d8ac355.png)


### What you think should happen instead

_No response_

### How to reproduce

_No response_

### Operating System

Ubuntu 22.04.1 LTS

### Versions of Apache Airflow Providers

Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy

### Deployment

Other

### Deployment details


Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy

### Anything else

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Clears DAG tasks."""
        dag_id = request.form.get("dag_id")
        task_id = request.form.get("task_id")
        origin = get_safe_url(request.form.get("origin"))
        dag = get_airflow_app().dag_bag.get_dag(dag_id)
        group_id = request.form.get("group_id")
        if "map_index" not in request.form:
            map_indexes: list[int] | None = None
        else:
            map_indexes = request.form.getlist("map_index", type=int)
        execution_date_str = request.form.get("execution_date")
        execution_date = _safe_parse_datetime(execution_date_str)
        confirmed = request.form.get("confirmed") == "true"
        upstream = request.form.get("upstream") == "true"
        downstream = request.form.get("downstream") == "true"
        future = request.form.get("future") == "true"
        past = request.form.get("past") == "true"
        recursive = request.form.get("recursive") == "true"
        only_failed = request.form.get("only_failed") == "true"