fix: internal server error on exchange query

[lenkan]

Fixes #115

@pfeairheller I just did the same thing you did in ExchangeResourceEnd from #116. This happened on both ExchangeResourceEnd and ExchangeQueryCollectionEnd.

[m00sey]

can we get a test that highlighted what was broken?

[codecov]

Codecov Report

Merging #117 (b62429d) into development (117a1ca) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development     #117   +/-   ##
============================================
  Coverage        91.87%   91.87%           
============================================
  Files               35       35           
  Lines             5671     5671           
============================================
  Hits              5210     5210           
  Misses             461      461           

Files	Coverage Δ
src/keria/peer/exchanging.py	90.00% <100.00%> (ø)

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[lenkan]

@m00sey I would like to try, but I could not find an example of a test that verified the same fix here: https://github.com/WebOfTrust/keria/pull/116/files#diff-c01bb1f6f142fd2e0b1a4f6afc37afabd7c247b268ee85d8e3c1f0f649bc22f9R169 on the ExchangeResourceEnd get method.

I can try to see if I can understand the current test_exchanging test. It would be great if it was split up into smaller pieces.

[lenkan]

@m00sey I tried to add a test here but I could not figure out how to add attachments to an exchange message in the test.

https://github.com/lenkan/keria/blob/103d8c9f97afa5bbdef72887414f4c795ca9a79a/tests/peer/test_exchanging.py#L149-L189

Do you have any pointers?

[pfeairheller]

I'll merge this and then submit a PR with a test.