fix: key states query operation internal server error (ksn.ked does not exist)

[lenkan]

Closes #150

I could not find any tests for this feature to update and currently do not have time to write something from scratch. Creating the PR anyway and you can decide if you want to takeover, wait for the tests or just merge it.

We are still not able to retrieve the updated state by using the key states query endpoint though. But that is another issue.

[pfeairheller]

If you rebase on development now, these tests should pass and we can merge it in

[lenkan]

If you rebase on development now, these tests should pass and we can merge it in

:+1: Rebased it now.

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0621cdb) 91.22% compared to head (0f16966) 91.22%.

Files	Patch %	Lines
src/keria/core/longrunning.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #151 +/- ## ============================================ Coverage 91.22% 91.22% ============================================ Files 35 35 Lines 6009 6009 ============================================ Hits 5482 5482 Misses 527 527 ```

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[lenkan]

Yes, was planning to give it a go. It will at the earliest be tomorrow. Probably not until next week due to the holidays. (Have some other things needing to get done before the week ends).

[m00sey]

@lenkan any update on adding the test?

[lenkan]

No, sorry. Been AFK for two weeks. Anyone feel free to pick it up if they need it done more urgently than myself. :)

[pfeairheller]

This was fixed in another PR already merged.