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ZOOKEEPER-5110: AdminServer "monitor" command fails with HTTP 500 (NullPointerException) while the peer is not serving - #2485
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…llPointerException) while the peer is not serving
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Restore ZOOKEEPER-3353 behavior which made the "monitor" admin command server-optional to avoid NPE, which can occur when no ZooKeeperServer exists (e.g. while a peer is in leader election)