2.x: fix replay() cancel/dispose NPE #5064
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This PR fixes both
Flowable.replay()andObservable.replay()throwing aNullPointerExceptionif the connection is disconnect before the upstream callsonSubscribeon the connection being established.In practice, this requires an async cancellation to happen through
refCount().unsubscribeOn()for example. The validation tests simulate this by not callingonSubscribeuntil the synchronous connect/disconnect happens.Reported in #5060.