[Swift] fix issue 1994: make sure we don't crash if rawValue returns … #2090
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…nil when trying to create an enumeration - instead return nil which allows the instance variable to be nil in this case (it will still try to unwrap the optional though if you declare the enumeration as a required property)
note: there aren't really any tests I can add to validate this since the service is always returning valid enumerations. but I did update the sample code.