Hotfix: Fix null object creation

[trevinhofmann]

Summary

Our null objects were created incorrectly. This fixes that.

https://www.bennadel.com/blog/2797-creating-objects-with-a-null-prototype-in-node-js.htm

Checklist

• Have you added unit and functional tests as appropriate?
• Did you update/add documentation for new methods or changed functionality?
• Have you merged the target branch down into this one?

How to Review

1. Review the code changes.

[codecov-io]

Codecov Report

Merging #75 into dev will not impact coverage.

@@           Coverage Diff           @@
##              dev      #75   +/-   ##
=======================================
  Coverage   86.38%   86.38%           
=======================================
  Files          16       16           
  Lines         360      360           
=======================================
  Hits          311      311           
  Misses         49       49

Impacted Files	Coverage Δ
src/store/checkin-store.js	96.15% <100%> (ø)	✅
src/store/student-store.js	98.14% <100%> (ø)	✅
src/store/item-store.js	95.65% <100%> (ø)	✅
src/store/model-store.js	96.49% <100%> (ø)	✅
src/store/checkout-store.js	90.9% <100%> (ø)	✅

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