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/utilities/ns-update/NsUpdateComponent.ts b/src/app/utilities/ns-update/NsUpdateComponent.ts
index 7efba70..724bba3 100644
--- a/src/app/utilities/ns-update/NsUpdateComponent.ts
+++ b/src/app/utilities/ns-update/NsUpdateComponent.ts
@@ -18,7 +18,6 @@
 /**
  * @file Ns Update Component
  */
-import { isNullOrUndefined } from 'util';
 import { HttpHeaders } from '@angular/common/http';
 import { Component, Injector, Input, OnInit } from '@angular/core';
 import { AbstractControl, FormBuilder, FormGroup, Validators } from '@angular/forms';
@@ -29,7 +28,7 @@
 import { environment } from 'environment';
 import { NSUPDATE, TERMINATEVNF } from 'NSInstanceModel';
 import { RestService } from 'RestService';
-import { SharedService } from 'SharedService';
+import { SharedService, isNullOrUndefined } from 'SharedService';
 import { VNFD } from 'VNFDModel';
 import { InstanceData, VNFInstanceDetails } from 'VNFInstanceModel';
 import { WarningComponent } from 'WarningComponent';