Fix the NPE for rebalance retry

[Jackie-Jiang]

Currently it will log a NPE for each table without previous rebalance job

[klsince]

👍

[codecov-commenter]

Codecov Report

Merging #11883 (fdb68b2) into master (c3f7b6d) will decrease coverage by 26.53%.
Report is 1 commits behind head on master.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             master   #11883       +/-   ##
=============================================
- Coverage     61.35%   34.83%   -26.53%     
+ Complexity     1146      946      -200     
=============================================
  Files          2373     2297       -76     
  Lines        128276   124539     -3737     
  Branches      19803    19246      -557     
=============================================
- Hits          78706    43383    -35323     
- Misses        43872    78132    +34260     
+ Partials       5698     3024     -2674     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (ø)
integration	<0.01% <0.00%> (ø)
integration1	<0.01% <0.00%> (ø)
integration2	0.00% <0.00%> (ø)
java-11	46.60% <ø> (+0.01%)	⬆️
java-21	34.71% <0.00%> (+7.13%)	⬆️
skip-bytebuffers-false	34.82% <0.00%> (-26.54%)	⬇️
skip-bytebuffers-true	34.69% <0.00%> (+34.69%)	⬆️
temurin	34.83% <0.00%> (-26.53%)	⬇️
unittests	46.64% <ø> (-14.71%)	⬇️
unittests1	46.64% <ø> (+0.05%)	⬆️
unittests2	?

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Files	Coverage Δ
...troller/helix/core/rebalance/RebalanceChecker.java	0.00% <0.00%> (-72.58%)	⬇️

... and 839 files with indirect coverage changes

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