Handle Logger.exception() outside "except" block

[sscherfke]

Summary

Fixes #634, follow-up of #635

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[hynek]

the tests are red 😇

also have you seen, that there's been changes to missing tracebacks lately – notably #657? 🤔 not sure if that maybe interacts somehow with your changes since it's thematically adjacent.

[sscherfke]

Didn't have time yet to fix the tests. Just recreated the MR for now. #657 is superfluous now. The problem it handled should no longer be possible with this PR.

[sscherfke]

Checks are green now. You should still carefully review the changes. ;-)

[sscherfke]

Do you need anything else from me for this PR to get merged? :-)

[hynek]

Sorry for the delays, I’ll get to structlog (there‘s quite a bit of open issues around exceptions 😰) right after pushing out attrs. I think it’s ready.