perf: Simplify executor return

[FrederikBolding]

Not guaranteed to give any massive speed up, but we know null is safe to return as-is.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.03%. Comparing base (b8792af) to head (acbc2f0).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3349      +/-   ##
==========================================
- Coverage   98.03%   98.03%   -0.01%     
==========================================
  Files         402      402              
  Lines       11112    11110       -2     
  Branches     1754     1754              
==========================================
- Hits        10894    10892       -2     
  Misses        218      218              

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