Fix potential NPE in OffHeapSingleTreeBuilder.close()

[Jackie-Jiang]

_starTreeRecordBuffer might not be set when star-tree build is interrupted (e.g. throws exception)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.59%. Comparing base (59551e4) to head (ce3063b).
Report is 1652 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14954      +/-   ##
============================================
+ Coverage     61.75%   63.59%   +1.84%     
- Complexity      207     1385    +1178     
============================================
  Files          2436     2710     +274     
  Lines        133233   151925   +18692     
  Branches      20636    23464    +2828     
============================================
+ Hits          82274    96622   +14348     
- Misses        44911    48031    +3120     
- Partials       6048     7272    +1224     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	⬆️
integration	100.00% <ø> (+99.99%)	⬆️
integration1	100.00% <ø> (+99.99%)	⬆️
integration2	0.00% <ø> (ø)
java-11	34.00% <50.00%> (-27.70%)	⬇️
java-21	63.59% <100.00%> (+1.97%)	⬆️
skip-bytebuffers-false	63.57% <100.00%> (+1.82%)	⬆️
skip-bytebuffers-true	63.57% <100.00%> (+35.84%)	⬆️
temurin	63.59% <100.00%> (+1.84%)	⬆️
unittests	63.59% <100.00%> (+1.84%)	⬆️
unittests1	56.08% <100.00%> (+9.19%)	⬆️
unittests2	34.01% <50.00%> (+6.28%)	⬆️

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