Do not send Status as null.

src/app/spreed-webrtc-server/channeling.go

@@ -73,7 +73,7 @@ type DataSession struct {
 	Version string      `json:",omitempty"`
 	Rev     uint64      `json:",omitempty"`
 	Prio    int         `json:",omitempty"`
-	Status  interface{}
+	Status  interface{} `json:",omitempty"`
 	stamp   int64
 }