gaozhangmin opened a new pull request #13720:
URL: https://github.com/apache/pulsar/pull/13720


   Fixes #13706
   
   ### Motivation
   From previous code, there are  chances policies.replication_clusters maybe 
null. We should check if it's null.
   
   
https://github.com/apache/pulsar/blob/a08f0f506e5985df50a818e601ee4b3869e1ce02/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java#L1371-L1376
   
   
   ### Modifications
   
   check If ReplicationClusters it's null
   
   
   
   ### Documentation
   
   Check the box below or label this PR directly (if you have committer 
privilege).
   
   Need to update docs? 
   
   - [ ] `doc-required` 
     
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   - [ ] `doc` 
     
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