fix: Allow empty list in sort_by in list.eval context

[kdn36]

fixes #25433

Unless there are reservations on the use of empty groups, this should be good to go.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.16%. Comparing base (850c943) to head (239c036).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25481      +/-   ##
==========================================
- Coverage   82.17%   82.16%   -0.02%     
==========================================
  Files        1727     1727              
  Lines      240170   240168       -2     
  Branches     3031     3031              
==========================================
- Hits       197358   197324      -34     
- Misses      42031    42063      +32     
  Partials      781      781              

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