Improve optional chaining checks

[SchrodingersGat]

• Fixes bug where part_detail is potentially undefined

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[codecov[bot]]

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 :warning:
src/frontend/src/forms/PurchaseOrderForms.tsx	0.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/inventree/InvenTree/pull/8431/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | Coverage Δ | | |---|---|---| | [pui](https://app.codecov.io/gh/inventree/InvenTree/pull/8431/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | `67.80% <0.00%> (-0.31%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree#carryforward-flags-in-the-pull-request-comment) to find out more.

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