Resolve TypeError crashes

[jtquach1]

Describe your changes

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Added ? after fields that are possibly undefined, so when subfields are accessed under those fields, the request-generator doesn't crash. The crashing is caused by trying to access an undefined object or undefined array at index 0. This isn't a code refactoring/overhaul PR, though.

Issue ticket number and Jira link

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N/A, found randomly while doing https://jira.mitre.org/browse/REMS-712.

To reproduce:

• In pims: use Node v21.7.3, checkout origin/dev, clear all orders from PIMS. Using branch update-etasu-check-to-use-intermediary also works, but that's because the "Send Rx" functionality hits a different endpoint than what the latter branch modifies.
• In request-generator: use this branch, select Jon Snow/Turalio, and click the "Send Rx" button.
• In rems-intermediary: use mongo-schema or mongo-update-standardization (I used the latter branch with Docker).
• In rems-smart-on-fhir: doesn't matter
• In test-ehr: used origin/dev

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