Change unkown regions/variables/... to throw proper errors

[phackstock]

No description provided.

[danielhuppmann]

I guess something like the pydantic error collection would be nice...

[phackstock]

If only someone wrote something like that 😆

[danielhuppmann]

I mean, an easy way would be to just write all error messages to a string and then include the string in the error message?

[phackstock]

Sure, it's going to be a short issue to tackle. The longest part is probably going to be to adjust the tests.
Potentially, we should align the entire error reporting. There are a number of other checks that rely on writing to the log instead of putting all the information into the error message.