fix(client-nuxt): preserve null in WithRefs type for nullable fields

[rigtigeEmil]

closes #3129

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Latest commit: 3935034

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.83%. Comparing base (0c09e6c) to head (3935034).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3131      +/-   ##
==========================================
- Coverage   33.39%   32.83%   -0.57%     
==========================================
  Files         429      430       +1     
  Lines       33654    34126     +472     
  Branches     2156     2157       +1     
==========================================
- Hits        11238    11204      -34     
- Misses      22388    22894     +506     
  Partials       28       28              

Flag	Coverage Δ
unittests	32.83% <ø> (-0.57%)	⬇️

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commit: 3935034