Proposed change to get_values behavior

[kfreezen]

get_values() did not load existing sections before checking the _sections property.

NOTE: Haven't written a test to check for this yet.

[kfreezen]

Proposed fix for #1534

[kfreezen]

Looking at test here; I suppose we can leave it raising a KeyError. The main fix was force-loading the _sections attribute before checking the list.

I'll re-commit using KeyError.

[Byron]

Thanks a lot, much appreciated!

I think the commit should link back to the issue it resolve to create a more declarative history.
Finally it should be possible to devise a test that would fail without this change to cement it. Otherwise it might be removed in future because it's unclear why eager loading of sections is necessary.

[Codym48]

@kfreezen, consider accepting kfreezen#1 to add test coverage for this change? I verified it fails on main:

[Byron]

Closing as it's superseded by #1555