use pointer for configchanges struct

server/handler/vmModify.go

@@ -33,7 +33,7 @@ func (h *Handler) VmModify(w http.ResponseWriter, r *http.Request) {
 		prettyPrint(event)
 	}
 
-	if (models.ConfigChangesReceived{} == event.CloudEvent.Data.ConfigChanges) {
+	if event.CloudEvent.Data.ConfigChanges == nil {
 		h.Logger.Debug("Received event contains no config change")
 	} else {
 		h.Logger.Debug("Received event contains config change info")

server/models/models.go

@@ -58,8 +58,8 @@ type CloudEventReceived struct {
 					Value string `json:"Value"`
 				} `json:"Vm"`
 			} `json:"Vm"`
-			ConfigSpec    *json.RawMessage      `json:"configSpec"`
-			ConfigChanges ConfigChangesReceived `json:"configChanges"`
+			ConfigSpec    *json.RawMessage       `json:"configSpec"`
+			ConfigChanges *ConfigChangesReceived `json:"configChanges"`
 		} `json:"data"`
 	} `json:"cloudEvent"`
 }