minor changes in logging and type check of socket messages

Author: janniclas

client/src/app/dashboard/graph-view/graph-view.service.ts

@@ -26,6 +26,7 @@ export class GraphViewService {
     this.elementRemover = new BehaviorSubject<Array<string>>([]);
 
     this.modelService.getObservableForInstances().subscribe((change: Change) => {
+      console.log('received notification in graph view service', change);
       if (change.elements !== undefined) {
         switch (change.type) {
           case Actions.ADD:
@@ -44,7 +45,7 @@ export class GraphViewService {
   }
 
   private addElements(instances: Array<Instance>) {
-    console.log('received new instance', instances);
+    console.log('received new instance in graph view service', instances);
     const newElements: NodeEdgeMap = instances.reduce(
       ( accumulator: NodeEdgeMap, value: Instance) => {
 

client/src/app/model/models/socketMessage.ts

@@ -81,5 +81,5 @@ export function payloadIsInstanceLink(payload: any): payload is InstanceLink {
 
 
 export function objectIsMessage(obj: any): obj is RegistryEvent {
-  return obj.eventType !== undefined && obj.payload !== undefined;
+  return obj !== null && obj.eventType !== undefined && obj.payload !== undefined;
 }