Fix UnhandledPromiseRejectionWarning in result #258
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It is possible to subscribe to `Result` with an observer which consists of three functions: `onNext`, `onError` and `onCompleted`. All three are optional. However result was not handling absence of `onCompleted` correctly which resulted in a failed promise and `UnhandledPromiseRejectionWarning`.
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It is possible to subscribe to
Resultwith an observer which consists of three functions:onNext,onErrorandonCompleted. All three are optional. However result was not handling absence ofonCompletedcorrectly which resulted in a failed promise andUnhandledPromiseRejectionWarning.Fixes #257