Jason918 opened a new pull request #12654:
URL: https://github.com/apache/pulsar/pull/12654
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### Motivation
Remove unused listeners if it have no listeners, avoid the map
(`SystemTopicBasedTopicPoliciesService#listeners`) from keep growing.
### Modifications
Remove the key from `listeners` if the value list is empty.
### Verifying this change
- [x] Make sure that the change passes the CI checks.
This change is a trivial rework / code cleanup without any test coverage.
### Does this pull request potentially affect one of the following parts:
*If `yes` was chosen, please highlight the changes*
- Dependencies (does it add or upgrade a dependency): (no)
- The public API: (no)
- The schema: (no)
- The default values of configurations: (no)
- The wire protocol: (no)
- The rest endpoints: (no)
- The admin cli options: (no)
- Anything that affects deployment: (no)
### Documentation
Check the box below and label this PR (if you have committer privilege).
Need to update docs?
- [x] `no-need-doc`
Simple optimization, no user doc needed.
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