Fix testing of min and optional requirements

[rly]

Motivation

See hdmf-dev/hdmf#876
Fixes the analogous issue here.

How to test the behavior?

Run tests

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running ruff from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.05 ⚠️

Comparison is base (6a3474e) 81.99% compared to head (d04210d) 81.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #99      +/-   ##
==========================================
- Coverage   81.99%   81.94%   -0.05%     
==========================================
  Files          11       11              
  Lines        2660     2664       +4     
==========================================
+ Hits         2181     2183       +2     
- Misses        479      481       +2     

Impacted Files	Coverage Δ
test_gallery.py	30.26% <50.00%> (+1.09%)	⬆️

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