[Trunk | Monitor Dashboard]: monitor.component.ts: Initialize activeTopic, activeCategory, activeSubCategory when url path changes (Bug fix: When a topic has no content do not show previous content).

git-svn-id: https://svn.driver.research-infrastructures.eu/driver/dnet40/modules/uoa-monitor-portal/trunk/monitor_dashboard@58692 d315682c-612b-4755-9ff5-7f18f6832af3

src/app/monitor/monitor.component.ts

@@ -91,6 +91,10 @@ export class MonitorComponent implements OnInit, OnDestroy, IDeactivateComponent
 
           this.route.params.subscribe(params => {
             this.loading = true;
+            this.activeTopic = null;
+            this.activeCategory = null;
+            this.activeSubCategory = null;
+
             if (subscription) {
               subscription.unsubscribe();
             }