Made pending tasks deletable if a task result exists

Partially addresses issue: #25".
Specifically,  "Deployments stuck in pending state with no ability to
control them".

src/app/my-appliances/components/deployments/deployment/deployment.component.ts

@@ -103,7 +103,10 @@ export class DeploymentComponent implements OnInit, OnDestroy {
     }
 
     isLatestTaskRunning() {
-        return this.deployment.latest_task.status === 'PENDING' || this.deployment.latest_task.status === 'PROGRESSING';
+        // Pending tasks should not have a task result. Sometimes, tasks are stuck in pending
+        // because they have errored out prior to launch - so check for the result too.
+        return (this.deployment.latest_task.status === 'PENDING' && !this.deployment.latest_task.result) ||
+                this.deployment.latest_task.status === 'PROGRESSING';
     }
 
     getKPDownloadLink(material: string) {

src/app/my-appliances/components/deployments/task-status-renderers/health-check-task-status.component.html

@@ -10,6 +10,9 @@
       <span *ngSwitchCase="'unknown'" class="text-info">
         <i class="fa fa-question-circle fa-fw"></i> UNKNOWN
       </span>
+      <span *ngSwitchCase="'not_found'" class="text-warning">
+        <i class="fa fa-exclamation-circle fa-fw"></i> NOT FOUND
+      </span>
       <span *ngSwitchCase="'pending'" class="text-info">
         <i class="fa fa-hourglass fa-fw"></i> PENDING
       </span>