Improve query argument type error message

[gordonwatts]

Very minor error message update - clarifies what has gone wrong when a query isn't in an expected format to give the user a little more information to understand what mistake they made.

Summary

• clarify query argument type errors by including the received type in the message
• test generic_query error output
• explicitly reject None for query arguments

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https://chatgpt.com/codex/tasks/task_e_689ba4c36e3c8320941bca450427fb4f

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.19%. Comparing base (1413cd7) to head (393cb38).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #642   +/-   ##
=======================================
  Coverage   97.19%   97.19%           
=======================================
  Files          29       29           
  Lines        1959     1961    +2     
=======================================
+ Hits         1904     1906    +2     
  Misses         55       55           

Flag	Coverage Δ
unittests	97.19% <100.00%> (+<0.01%)	⬆️

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