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

Fixed the errors it threw up.

overlord/src/app/incentive/incentive.component.ts

@@ -108,7 +108,7 @@ export class IncentiveComponent implements OnInit {
   }
 
   change(row: Incentive, i: number) {
-    row.points = this.form.controls.incentives.controls[i].value.points!;
+    row.points = this.form.controls.incentives.controls[i].value.points ?? 0;
     this.form.controls.incentives.controls[i].setValue({ points: row.points });
   }
 
@@ -168,7 +168,7 @@ export class IncentiveComponent implements OnInit {
     const array = this.form.controls.incentives;
 
     this.voucher.incentives.forEach((item, index) => {
-      item.points = array.controls[index].value.points!;
+      item.points = array.controls[index].value.points ?? 0;
     });
     return this.voucher;
   }