Ensure invalid query parameters warn instead of erroring

[philippjfr]

An invalid query parameter should not be able to break an app.

[codecov]

Codecov Report

Merging #5781 (0f380ee) into main (f8a8b08) will decrease coverage by 0.01%.
Report is 3 commits behind head on main.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #5781      +/-   ##
==========================================
- Coverage   73.61%   73.61%   -0.01%     
==========================================
  Files         290      290              
  Lines       42224    42231       +7     
==========================================
+ Hits        31085    31087       +2     
- Misses      11139    11144       +5     

Flag	Coverage Δ
unitexamples-tests	73.61% <66.66%> (-0.01%)	⬇️

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Files	Coverage Δ
panel/util/__init__.py	83.27% <66.66%> (-0.39%)	⬇️

... and 3 files with indirect coverage changes

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