Fix jetstream PagedIterator infinite loop #589
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On current nats server version (2.8) when a paged request is made to jetstream (e.g. to list the stream names), the page will never be empty, making the last page being repeated over and over and hanging if callingcollect() on it.
This fix implements the same fix as jsm.go(5a418c) manager.go +236 by stopping when detecting it's the last page.