fix(explore-tab): check bubbleIframeUrlWithJWTToken before usage

Author: sultanmyrza

src/app/features/home/explore-tab/explore-tab/explore-tab.component.html

@@ -6,8 +6,14 @@
 </div>
 
 <ng-template #bubbleIframe>
-  <iframe
-    [src]="bubbleIframeUrlWithJWTToken$ | ngrxPush | safeResourceUrl"
-    class="bubble-iframe"
-  ></iframe>
+  <div
+    *ngIf="
+      bubbleIframeUrlWithJWTToken$ | ngrxPush as bubbleIframeUrlWithJWTToken
+    "
+  >
+    <iframe
+      [src]="bubbleIframeUrlWithJWTToken | safeResourceUrl"
+      class="bubble-iframe"
+    ></iframe>
+  </div>
 </ng-template>