Should be: DOMString ? message = null;
Created attachment 675539 [details] [diff] [review] Patch Handle null and undefined as correct values and not convert them to string.
Comment on attachment 675539 [details] [diff] [review] Patch [Approval Request Comment] Bug caused by (feature/regressing bug #): Followup bug 794011 User impact if declined: We need more checks in our USSD UI (need to check against strings like "undefined" and "null" instead of object null and undefined). Testing completed (on m-c, etc.): m-i Risk to taking this patch (and alternatives if risky): None String or UUID changes made by this patch: None