Make the viewer's handling of scripting commands more robust

[calixteman]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.03704% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.50%. Comparing base (9071f45) to head (8613b44).

Files with missing lines	Patch %	Lines
web/app.js	78.94%	4 Missing ⚠️
web/pdf_scripting_manager.js	90.32%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21381      +/-   ##
==========================================
+ Coverage   89.39%   89.50%   +0.10%     
==========================================
  Files         260      260              
  Lines       65940    65981      +41     
==========================================
+ Hits        58950    59059     +109     
+ Misses       6990     6922      -68     

Flag	Coverage Δ
browsertest	66.66% <0.00%> (+0.14%)	⬆️
fonttest	9.06% <ø> (ø)
integrationtest	67.15% <87.03%> (+0.41%)	⬆️
unittest	56.97% <0.00%> (-0.05%)	⬇️
unittestcli	55.92% <0.00%> (-0.05%)	⬇️

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