Fix null bodies in schema

[iblancasa]

Link to tracking issue

Fixes #15728

Authorship

• I, a human, wrote this pull request description myself.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.07%. Comparing base (be178a7) to head (4073c63).
⚠️ Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15729      +/-   ##
==========================================
+ Coverage   91.04%   91.07%   +0.02%     
==========================================
  Files         731      732       +1     
  Lines       48519    48514       -5     
==========================================
+ Hits        44175    44184       +9     
+ Misses       3020     3011       -9     
+ Partials     1324     1319       -5     

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