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/roles/roles-create-edit/RolesCreateEditComponent.ts b/src/app/roles/roles-create-edit/RolesCreateEditComponent.ts
index 59196ea..ae85112 100644
--- a/src/app/roles/roles-create-edit/RolesCreateEditComponent.ts
+++ b/src/app/roles/roles-create-edit/RolesCreateEditComponent.ts
@@ -18,7 +18,6 @@
 /**
  * @file Roles Create and Edit Component
  */
-import { isNullOrUndefined } from 'util';
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { Component, Injector, Input, OnInit } from '@angular/core';
 import { FormBuilder, FormGroup, Validators } from '@angular/forms';
@@ -30,7 +29,7 @@
 import * as jsonpath from 'jsonpath';
 import { RestService } from 'RestService';
 import { Permission, PermissionGroup, RoleConfig, RoleData } from 'RolesModel';
-import { SharedService } from 'SharedService';
+import { SharedService, isNullOrUndefined } from 'SharedService';
 
 /**
  * Creating component