ephraimbuddy opened a new pull request #13959:
URL: https://github.com/apache/airflow/pull/13959
Currently, when you request for dag details of a DAG with no start_date, it
throughs an error:
```
{
"detail": "None is not of type 'string'\n\nFailed validating 'type' in
schema['allOf'][1]['properties']['start_date']:\n {'format': 'date-time',
'readOnly': True, 'type': 'string'}\n\nOn instance['start_date']:\n None",
"status": 500,
"title": "Response body does not conform to specification",
"type":
"http://apache-airflow-docs.s3-website.eu-central-1.amazonaws.com/docs/apache-airflow/latest/stable-rest-api-ref.html#section/Errors/Unknown";
}
```
This PR resolves this by nullifying the start_date of DAG detail schema in
openapi
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