1.x: fix singleOrDefault() backpressure if source is empty #3905
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This was referenced May 2, 2016
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It gets here in case upstream ignored the unsubscription or is simply ignoring backpressure. There is no error here unless you want to new up and then sink some error.
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Issue #3892 is a goldmine for missing backpressure problems. This PR fixes the case when
singleOrDefaultencounters an empty source and has to emit some default value. Fixed via setting theSingleProduceron the child on termination.