fixed UI issues related to deleting (component is now correctly removed from the dashboard device list).

fixes #69

webapp/frontend/src/app/modules/dashboard/dashboard.component.ts

@@ -229,7 +229,9 @@ export class DashboardComponent implements OnInit, AfterViewInit, OnDestroy
     deviceSummariesForHostGroup(hostGroupWWNs: string[]) {
         let deviceSummaries = []
         for(let wwn of hostGroupWWNs){
-            deviceSummaries.push(this.data.data.summary[wwn])
+            if(this.data.data.summary[wwn]){
+                deviceSummaries.push(this.data.data.summary[wwn])
+            }
         }
         return deviceSummaries
     }
@@ -242,6 +244,10 @@ export class DashboardComponent implements OnInit, AfterViewInit, OnDestroy
         });
     }
 
+    onDeviceDeleted(wwn: string) {
+        delete this.data.data.summary[wwn] // remove the device from the summary list.
+    }
+
     /*
 
     DURATION_KEY_WEEK    = "week"