Fix the NPE when metadataTTL is enabled without delete column

[Jackie-Jiang]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 0.00%. Comparing base (59551e4) to head (2235b32).
Report is 511 commits behind head on master.

Files	Patch %	Lines
...cal/upsert/BasePartitionUpsertMetadataManager.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #13262       +/-   ##
=============================================
- Coverage     61.75%    0.00%   -61.75%     
+ Complexity      207        6      -201     
=============================================
  Files          2436     2459       +23     
  Lines        133233   135357     +2124     
  Branches      20636    20988      +352     
=============================================
- Hits          82274        6    -82268     
- Misses        44911   135351    +90440     
+ Partials       6048        0     -6048     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	0.00% <0.00%> (-61.71%)	⬇️
java-21	<0.01% <0.00%> (-61.63%)	⬇️
skip-bytebuffers-false	<0.01% <0.00%> (-61.75%)	⬇️
skip-bytebuffers-true	0.00% <0.00%> (-27.73%)	⬇️
temurin	<0.01% <0.00%> (-61.75%)	⬇️
unittests	?
unittests1	?
unittests2	?

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