(GH-422) - Allow ref to be optional in fixtures

[jordanbreen28]

Summary

See #422
Ref is optional in fixtures, thus can be nil. Adding the Safe Navigation Operator prevents an undefined method for Nil:nil class error

Additional Context

Add any additional context about the problem here.

• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

Fixes #422

Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ce3a8e2) 41.71% compared to head (b545f3f) 41.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #430   +/-   ##
=======================================
  Coverage   41.71%   41.71%           
=======================================
  Files          10       10           
  Lines         676      676           
=======================================
  Hits          282      282           
  Misses        394      394           

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