nathadfield opened a new issue #18909:
URL: https://github.com/apache/airflow/issues/18909
### Apache Airflow version
2.2.0 (latest released)
### Operating System
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"NAME="Debian GNU/Linux"
VERSION_ID="11" VERSION="11 (bullseye)" VERSION_CODENAME=bullseye ID=debian
### Versions of Apache Airflow Providers
_No response_
### Deployment
Astronomer
### Deployment details
_No response_
### What happened
When providing a dict to `params`, `None` is no longer accepted as a value
and the DAG fails to parse.
```
Broken DAG: [/usr/local/airflow/dags/test.py] Traceback (most recent call
last):
File "/usr/local/lib/python3.9/site-packages/airflow/models/dag.py", line
481, in __init__
self.validate_schedule_and_params()
File "/usr/local/lib/python3.9/site-packages/airflow/models/dag.py", line
2636, in validate_schedule_and_params
raise AirflowException(
airflow.exceptions.AirflowException: DAG Schedule must be None, if there are
any required params without default values
```
-
### What you expected to happen
This is a change in behaviour from 2.1.x
### How to reproduce
The following DAG code will reproduce the error.
```from datetime import datetime, timedelta
from airflow import models
from airflow.operators.dummy import DummyOperator
params = {
'key': None
}
default_args = {
'owner': 'airflow',
'retries': 2,
'retry_delay': timedelta(minutes=5)
}
with models.DAG(
'my_dag',
default_args=default_args,
start_date=datetime(2021, 10, 1),
schedule_interval='0 0 * * *',
params=params
) as dag:
test = DummyOperator(
task_id='test'
)
### Anything else
The issue is a result of the work involved in #17100; specifically the
method `validate_schedule_and_params`
https://github.com/apache/airflow/blob/main/airflow/models/dag.py#L2625
### 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)
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