Switched on the @typescript-eslint/no-non-null-assertion rule in eslint.

Fixed the errors it threw up.

overlord/src/app/role/role-detail/role-detail.component.ts

@@ -103,10 +103,10 @@ export class RoleDetailComponent implements OnInit, AfterViewInit {
 
   getItem(): Role {
     const formModel = this.form.value;
-    this.item.name = formModel.name!;
+    this.item.name = formModel.name ?? '';
     const array = this.form.controls.permissions;
     this.item.permissions.forEach((item, index) => {
-      item.enabled = array.controls[index].value.permission!;
+      item.enabled = array.controls[index].value.permission ?? false;
     });
     return this.item;
   }