feat(frontend): Hide empty args in about dialog

[matmair]

This cleans up the "About" dialog a bit:

• removes nulls from copy text
• hides commit info if it is not available

[netlify]

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[codecov]

Codecov Report

Attention: Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.

Project coverage is 85.51%. Comparing base (e1f25a0) to head (5c77baf).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...tend/src/components/modals/AboutInvenTreeModal.tsx	61.11%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9033      +/-   ##
==========================================
- Coverage   85.62%   85.51%   -0.12%     
==========================================
  Files        1177     1177              
  Lines       52012    52024      +12     
  Branches     2115     2118       +3     
==========================================
- Hits        44536    44488      -48     
- Misses       6928     6997      +69     
+ Partials      548      539       -9     

Flag	Coverage Δ
pui	68.93% <61.11%> (-0.56%)	⬇️

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[SchrodingersGat]

"commit branch" looks wrong here:

[matmair]

The rendered args have not changed - is your testing environment providing that information in the old dialog?

[matmair]

If you are using the test deploy: for some reason the branch is not detected there