Fixed notifications

src/app/shared/notifications/notification/notification.component.ts

@@ -129,6 +129,7 @@ export class NotificationComponent implements OnInit, OnDestroy {
       this[key] = item;
     } else if (key === 'title' || key === 'content') {
       let value = null;
+      if (isNotEmpty(item)) {
         if (typeof item === 'string') {
           value = Observable.of(item);
         } else if (item instanceof Observable) {
@@ -139,6 +140,7 @@ export class NotificationComponent implements OnInit, OnDestroy {
           // so converts it again to Observable
           value = Observable.of(item.value);
         }
+      }
       this[key] = value
     } else {
       this[key] = this.domSanitizer.bypassSecurityTrustHtml(item);