Observable.from(empty) to emit onComplete even when 0 requested #2899
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As per discussion in #2884,
Observable.from(iterable)
is preferred to emitonCompleted
wheniterable
is empty even when nothing has been requested.This PR adds a check on
iterator.hasNext
before theProducer
is assigned and emitsonCompleted
immediately ifhasNext
returns false.Includes unit test that failed on existing code base.