fix NPE in category tree factory

[jenschude]

Closes #1033

• Changeset added

Features

Fixes

Breaking changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 9.80%. Comparing base (6ac355c) to head (5c2ff5e).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #1035   +/-   ##
=======================================
  Coverage     9.80%   9.80%           
  Complexity    2086    2086           
=======================================
  Files         8098    8098           
  Lines        78306   78306           
  Branches       355     355           
=======================================
  Hits          7675    7675           
  Misses       70434   70434           
  Partials       197     197           

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[ShipilA]

Looks great!