Summary | Résumé

This PR unifies the return types of all get methods so they return None if keys or fields are not found. It also improves method docstrings to clarify parameter data formats when using ambiguous data structures.

Related Issues | Cartes liées

Test instructions | Instructions pour tester la modification

Tests pass, release, tag, and test integration in Admin and API.

Release Instructions | Instructions pour le déploiement

None.

Reviewer checklist | Liste de vérification du réviseur

• This PR does not break existing functionality.
• This PR does not violate GCNotify's privacy policies.
• This PR does not raise new security concerns. Refer to our GC Notify Risk Register document on our Google drive.
• This PR does not significantly alter performance.
• Additional required documentation resulting of these changes is covered (such as the README, setup instructions, a related ADR or the technical documentation).

⚠ If boxes cannot be checked off before merging the PR, they should be moved to the "Release Instructions" section with appropriate steps required to verify before release. For example, changes to celery code may require tests on staging to verify that performance has not been affected.