Handle missing attributes in _custom_object_schema

[alexmojaki]

Point 2 of #573

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b7d8372) to head (bc3c807).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #597   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          133       133           
  Lines        10443     10448    +5     
  Branches      1428      1430    +2     
=========================================
+ Hits         10443     10448    +5     

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