adamszustak opened a new issue, #49157:
URL: https://github.com/apache/airflow/issues/49157
### Apache Airflow version
Other Airflow 2 version (please specify below)
### If "Other Airflow 2 version" selected, which one?
2.9.3
### What happened?
Despite missing the `retries` (set to None) parameter, DAG was successfully
triggered. However, a separate attempt to list DAG tasks using API produced the
following error:
```
{
"detail": "None is not of type 'number'\n\nFailed validating 'type' in
schema['properties']['tasks']['items']['properties']['retries']:\n {'type':
'number', 'readOnly': True}\n\nOn instance['tasks'][0]['retries']:\n None",
"status": 500,
"title": "Response body does not conform to specification",
"type":
"https://airflow.apache.org/docs/apache-airflow/2.9.3/stable-rest-api-ref.html#section/Errors/Unknown";
}
```
After removing `retries` param or adding integer to it, endpoint returns
data.
### What you think should happen instead?
Dag tasks listing call should not fail if the DAG `retries` is not defined.
### How to reproduce
1. Write DAG with `retries` set to None
2. Issue request to `https://<composer-url>/api/v1/dags/<dag-id>/tasks`
### Operating System
composer-2.10.1-airflow-2.9.3
### Versions of Apache Airflow Providers
apache-airflow==2.9.3+composer
apache-airflow-providers-apache-beam==5.9.1
apache-airflow-providers-celery==3.8.5
apache-airflow-providers-cncf-kubernetes==10.0.1
apache-airflow-providers-common-compat==1.2.2
apache-airflow-providers-common-io==1.4.2
apache-airflow-providers-common-sql==1.20.0
apache-airflow-providers-dbt-cloud==3.11.2
apache-airflow-providers-fab==1.2.2
apache-airflow-providers-ftp==3.11.1
apache-airflow-providers-google==10.26.0
apache-airflow-providers-hashicorp==3.8.0
apache-airflow-providers-http==4.13.3
apache-airflow-providers-imap==3.7.0
apache-airflow-providers-mysql==5.7.4
apache-airflow-providers-postgres==5.14.0
apache-airflow-providers-sendgrid==3.6.0
apache-airflow-providers-smtp==1.8.1
apache-airflow-providers-sqlite==3.9.1
apache-airflow-providers-ssh==3.14.0
### Deployment
Google Cloud Composer
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [x] 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)
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