Make ImagingPlane.description optional

[rly]

Motivation

Fix #2049

Checklist

• [x] Did you update CHANGELOG.md with your changes?
• [x] Have you checked our Contributing document?
• [x] Have you ensured the PR clearly describes the problem and the solution?
• [x] Is your contribution compliant with our coding style? This can be checked running ruff check . && codespell from the source directory.
• [x] Have you checked to ensure that there aren't other open Pull Requests for the same change?
• [x] 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[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 94.96%. Comparing base (618df86) to head (03f20ff). :warning: Report is 18 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2051      +/-   ##
==========================================
+ Coverage   94.95%   94.96%   +0.01%     
==========================================
  Files          28       28              
  Lines        2832     2840       +8     
  Branches      725      729       +4     
==========================================
+ Hits         2689     2697       +8     
  Misses         87       87              
  Partials       56       56              

Flag	Coverage Δ
integration	74.33% <0.00%> (-0.21%)	:arrow_down:
unit	84.82% <100.00%> (+0.04%)	:arrow_up:

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[rly]

Looks good. Thank you @stephprince ! Could you please approve?