WIP-4: Replace ._get with a proper typed value

[flacial]

Related to #2477

Description

Replace ._get reference with optional chaining operator.

[vercel]

@flacial is attempting to deploy a commit to the c0d3-prod Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
c0d3-app	✅ Ready (Inspect)	Visit Preview	Nov 14, 2022 at 4:59PM (UTC)

[codecov]

Codecov Report

Merging #2514 (3d00c8e) into master (82d715b) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 3d00c8e differs from pull request most recent head 17cdebb. Consider uploading reports for the commit 17cdebb to get more accurate results

@@            Coverage Diff            @@
##            master     #2514   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          186       186           
  Lines         3355      3353    -2     
  Branches       900       900           
=========================================
- Hits          3355      3353    -2     

Impacted Files	Coverage Δ
components/AppNav/AppNav.tsx	100.00% <100.00%> (ø)
...mponents/admin/lessons/AdminLessonExerciseCard.tsx	100.00% <0.00%> (ø)