fix morph_modifiers check

[ilkilic]

When morph_modifiers was an empty list, the check incorrectly evaluated it as false, leading to the use of default morph_modifiers

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.45%. Comparing base (8d5b0ab) to head (5ff951b).
Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
- Coverage   60.07%   53.45%   -6.63%     
==========================================
  Files         109      122      +13     
  Lines        7838     9668    +1830     
==========================================
+ Hits         4709     5168     +459     
- Misses       3129     4500    +1371     

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[darshanmandge]

Thanks. @AurelienJaquier we have check emodels now with this change