Just as an FYI: If you edit a block and save it, empty fields are saved as empty strings. This works out fine most of the time, but the AWS credentials block does not work because (from the boto3 session.py):

if profile_name is None:
            return profile_map.get('default', {})
        elif profile_name not in profile_map:
            ....

So if you do not want to use a profile you have to overwrite

profile_name

manually with

None

in your code and then save it again. A fix would be, as an example, a checkbox next to nullable fields to set this field to null.

That’s a good idea, Tim. are you able to open an issue proposing it at the repo?

Sure! Will do.