Omitted requireOneSlicingArgument if not set in listSize directive

[glen-84]

Summary of the changes (Less than 80 chars)

• Omitted requireOneSlicingArgument if not set in listSize directive.

Closes #7398

---

• @michaelstaib to add another test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.13%. Comparing base (e3c132c) to head (94a3c41).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7418   +/-   ##
=======================================
  Coverage   74.13%   74.13%           
=======================================
  Files        2674     2674           
  Lines      140657   140661    +4     
  Branches    16358    16358           
=======================================
+ Hits       104282   104286    +4     
- Misses      30780    30783    +3     
+ Partials     5595     5592    -3     

Flag	Coverage Δ
unittests	74.13% <ø> (+<0.01%)	⬆️

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