Improve optional chaining checks

[SchrodingersGat]

• Fixes bug where part_detail is potentially undefined

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 84.34%. Comparing base (7b640a4) to head (64b73d9).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/frontend/src/forms/StockForms.tsx	0.00%	4 Missing ⚠️
src/frontend/src/forms/PurchaseOrderForms.tsx	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8431      +/-   ##
==========================================
- Coverage   84.40%   84.34%   -0.06%     
==========================================
  Files        1170     1170              
  Lines       53459    53459              
  Branches     2002     2002              
==========================================
- Hits        45120    45091      -29     
- Misses       7823     7854      +31     
+ Partials      516      514       -2     

Flag	Coverage Δ
pui	67.80% <0.00%> (-0.31%)	⬇️

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[matmair]

Lgtm; solves a few warnings from the sast too