fix(rust): Expr.over() returning List type when DataFrame is empty

[dongchao-1]

close #22006

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.15%. Comparing base (703d7bb) to head (7697d32).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22201      +/-   ##
==========================================
+ Coverage   80.93%   81.15%   +0.22%     
==========================================
  Files        1639     1638       -1     
  Lines      235871   235194     -677     
  Branches     2714     2714              
==========================================
- Hits       190896   190867      -29     
+ Misses      44335    43687     -648     
  Partials      640      640              

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