Fixed issue that did not allow nulls when parsing nested lists.

[michaelstaib]

Closes #7475

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.86%. Comparing base (2ed9217) to head (415c7b9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7479      +/-   ##
==========================================
- Coverage   77.86%   77.86%   -0.01%     
==========================================
  Files        2827     2827              
  Lines      142058   142059       +1     
==========================================
- Hits       110613   110608       -5     
- Misses      31445    31451       +6     

Flag	Coverage Δ
unittests	77.86% <100.00%> (-0.01%)	⬇️

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