fix: if no value is provided, use the root asset folder

[12rambau]

Fix #330

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.84%. Comparing base (020a067) to head (2c81178).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #344      +/-   ##
==========================================
- Coverage   91.02%   90.84%   -0.18%     
==========================================
  Files          27       27              
  Lines        1371     1366       -5     
  Branches       65       65              
==========================================
- Hits         1248     1241       -7     
- Misses        107      108       +1     
- Partials       16       17       +1     

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