yuruguo opened a new pull request, #19029:
URL: https://github.com/apache/pulsar/pull/19029

   ### Motivation
   Check `topicsPattern` is not null or empty when invoking 
`ConsumerBuilder.topicsPattern`. 
   ```java
   ConsumerBuilder<T> topicsPattern(Pattern topicsPattern);
   ConsumerBuilder<T> topicsPattern(String topicsPattern);
   ```
   
   ### Modifications
   Check `topicsPattern` is not null or empty when invoking 
`ConsumerBuilder.topicsPattern`. 
   
   ### Documentation
   - [ ] `doc` <!-- Your PR contains doc changes. Please attach the local 
preview screenshots (run `sh start.sh` at `pulsar/site2/website`) to your PR 
description, or else your PR might not get merged. -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
later -->
   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   
   ### Matching PR in forked repository
   PR in forked repository: 
   


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