Check for empty Leader #524
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For stream and consumer cluster step-down, check for empty leader before proceeding with step-down command.
In a case where there is no current leader (not a happy path case albeit), the CLI message is mis-formatted under this condition, e.g.
Requesting leader step down of "" in a 4 peer RAFT group nats: error: JetStream system temporarily unavailable (10008), try --help(where it's actually an R3).