Angular upgrade

	- Upgraded Angular from 14 to 15 version.

Change-Id: I2339a04020153cbc9ed7a14bfe8e0aa265e507da
Signed-off-by: SANDHYA.JS <sandhya.j@tataelxsi.co.in>
diff --git a/src/app/dashboard/DashboardComponent.ts b/src/app/dashboard/DashboardComponent.ts
index d49f708..8112c06 100644
--- a/src/app/dashboard/DashboardComponent.ts
+++ b/src/app/dashboard/DashboardComponent.ts
@@ -18,7 +18,6 @@
 /**
  * @file Dashboard Component
  */
-import { isNullOrUndefined } from 'util';
 import { Component, Injector, OnInit } from '@angular/core';
 import { TranslateService } from '@ngx-translate/core';
 import { NotifierService } from 'angular-notifier';
@@ -35,7 +34,7 @@
 import { RestService } from 'RestService';
 import { Observable, Subscription } from 'rxjs';
 import { SDNControllerModel } from 'SDNControllerModel';
-import { SharedService } from 'SharedService';
+import { SharedService, isNullOrUndefined } from 'SharedService';
 import { ProjectRoleMappings, UserDetail } from 'UserModel';
 import { VimAccountDetails } from 'VimAccountModel';
 import { VNFInstanceDetails } from 'VNFInstanceModel';