Don't error in SchemaStore when schema fields are missing

[sandreae]

Currently we return an error from get_schema or get_all_schema in SchemaStore if a schema cannot be constructed due to it's fields not being present in the database. This isn't the behaviour we expect, rather we want to ignore any schemas which can't be fully constructed.

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

Merging #192 (05eab8a) into main (54e2aff) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
- Coverage   93.62%   93.62%   -0.01%     
==========================================
  Files          42       42              
  Lines        3155     3152       -3     
==========================================
- Hits         2954     2951       -3     
  Misses        201      201              

Impacted Files	Coverage Δ
aquadoggo/src/db/stores/schema.rs	97.77% <100.00%> (-0.05%)	⬇️

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[adzialocha]

Nice! Thank you for fixing this!

I'd add some more comments on why certain things are the way there are, but otherwise its ready to go!