### 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)

table = [
                (section, key, str(value), source)
                for section, parameters in conf.as_dict(True, display_sensitive).items()
                for key, (value, source) in parameters.items()
            ]
            return self.render_template(
                template="airflow/config.html",
                title=title,
                table=table,
            )
        else:
            return self.render_template(
                "airflow/config.html",
                title=title,
                hide_config_msg=(
                    "Your Airflow administrator chose not to expose the configuration, "
                    "most likely for security reasons."
                ),
            )
class RedocView(AirflowBaseView):
    """Redoc Open API documentation"""
    default_view = "redoc"
    @expose("/redoc")
    def redoc(self):
        """Redoc API documentation."""
        openapi_spec_url = url_for("/api/v1./api/v1_openapi_yaml")
        return self.render_template("airflow/redoc.html", openapi_spec_url=openapi_spec_url)
class DagFilter(BaseFilter):
    """Filter using DagIDs"""
    def apply(self, query, func):