congbobo184 opened a new pull request #12758:
URL: https://github.com/apache/pulsar/pull/12758


   fix https://github.com/apache/pulsar/issues/12754
   ### Motivation
   Now when delete topic, we will write a null value to Transaction buffer 
snapshot topic, other topic recover by this transaction buffer snapshot system 
topic, will produce NPE
   
   ### Modifications
   judge NPE logic
   
   ### Verifying this change
   
   add some test for it 
   
   
   


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