fix: throw null pointer exception if the set value is null in RowBuilder

[dl239]

close #3637

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (71cf61e) 74.94% compared to head (314f2f2) 40.24%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...adigm/openmldb/common/codec/ClassicRowBuilder.java	66.66%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #3649       +/-   ##
=============================================
- Coverage     74.94%   40.24%   -34.70%     
- Complexity      640      648        +8     
=============================================
  Files           724      191      -533     
  Lines        130414    11245   -119169     
  Branches       1325     1329        +4     
=============================================
- Hits          97743     4526    -93217     
+ Misses        32378     6421    -25957     
- Partials        293      298        +5     

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