[PUI] Check length before access

[SchrodingersGat]

• Small bug fix for checking array length before accessing

[netlify]

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Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 86 (no change from production) Best Practices: 92 (no change from production) SEO: 70 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.38%. Comparing base (d6218b7) to head (7c39007).
Report is 314 commits behind head on master.

Files with missing lines	Patch %	Lines
src/frontend/src/pages/part/PartDetail.tsx	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7923      +/-   ##
==========================================
- Coverage   83.39%   83.38%   -0.01%     
==========================================
  Files        1131     1131              
  Lines       50389    50403      +14     
  Branches     1754     1758       +4     
==========================================
+ Hits        42020    42031      +11     
- Misses       7923     7924       +1     
- Partials      446      448       +2     

Flag	Coverage Δ
pui	64.75% <33.33%> (+0.02%)	⬆️

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