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KAFKA-15218: Avoid NPE thrown while deleting topic and fetch from fol…
…lower concurrently (apache#14051) When deleting topics, we'll first clear all the remoteReplicaMap when stopPartitions here. But this time, there might be fetch request coming from follower, and try to check if the replica is eligible to be added into ISR here. At this moment, NPE will be thrown. Although it's fine since this topic is already deleted, it'd be better to avoid it happen. Reviewers: Luke Chen <showuon@gmail.com>
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