jens-scheffler-bosch commented on issue #33923:
URL: https://github.com/apache/airflow/issues/33923#issuecomment-1701034592
Question is what "everything" means in your case. In Jinja you can `{{
params.mylist | default([]) }}` and inside Python code it would be `for item in
params.mylist or []: ...` if you require to loop w/o checking the content. Main
purpose of typing validation is that you can trust submitted params before
handling it in the code. If you field is not required you anyway need to take
care to handle "missing data" for example if called via CLI or REST API.
On the other hand if an empty list would be passed as `[]` to the DAG,
validation for required fields would be harder. Then you need to add a
`minItems` schema definition if you want to enforece that users add at least
one item.. Makes the form validation much more complex, standard jQuery
mechanisms for required fields are not working easily in this example.
I'd prefer to keep it consistent that "missing data" is passed as
`null`/`None` as it is stated in the docs currently. Otherwise we would need to
define the empty handling different per type and document this.
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