Aias00 opened a new issue, #1192:
URL: https://github.com/apache/rocketmq-dashboard/issues/1192

   ## Problem
   `RocketMQDashboardProvider` handles null topology maps but still 
dereferences a null `TopicList` and iterates a null cluster broker-name set. 
NameServer or broker responses with either partial field can fail the dashboard 
refresh and return an empty overview.
   
   ## Scope
   Track 1 / BASE-01 dashboard resilience.
   
   ## Expected
   - Treat a null topic list as zero topics.
   - Treat a null broker membership set as an empty cluster membership.
   - Preserve the remaining dashboard topology and add focused regression 
coverage.


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