fix: Allow undefined for useTablePlugin irisGridUtils

[mattrunyon]

Small thing needed for ui.resolve b/c the JS API may not be available on mount of UITable, so irisGridUtils may be null

This won't affect any rendering of table plugins since model is also required and possibly undefined until the JS API and table are loaded.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.59%. Comparing base (a155da6) to head (0c61e79).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2515      +/-   ##
==========================================
- Coverage   44.61%   44.59%   -0.02%     
==========================================
  Files         763      764       +1     
  Lines       42715    42778      +63     
  Branches    10947    10962      +15     
==========================================
+ Hits        19057    19078      +21     
- Misses      23600    23641      +41     
- Partials       58       59       +1     

Flag	Coverage Δ
unit	44.59% <100.00%> (-0.02%)	⬇️

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