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

Fixed the errors it threw up.

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

@@ -107,8 +107,8 @@ export class ClientDetailComponent implements OnInit, AfterViewInit {
 
   getItem(): Client {
     const formModel = this.form.value;
-    this.item.name = formModel.name!;
-    this.item.enabled = formModel.enabled!;
+    this.item.name = formModel.name ?? '';
+    this.item.enabled = formModel.enabled ?? false;
     this.item.otp = formModel.otp || undefined;
     return this.item;
   }