Non-empty stack traces for operator exceptions. #1324
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Improves #1235 by ensuring there's a
StackTracefor operators such asSingleAsyncwhen propagating onOnErrorexception they've created themselves. Because there's no stack to unwind (observer.OnErrorgoes "the other way"), the exception info is limited to the current frame (e.g.OnCompletedinSingleAsyncnoticing there was no element and thus propagating anInvalidOperationException). At the very least, it gives a clue about the operator that caused it. Further root cause analysis remains a debugging task (e.g. why the sequence produced no elements) but this can help to steer investigations.