default to null

src/models/view/cardView.ts

@@ -4,12 +4,12 @@ import { Card } from '../domain/card';
 
 export class CardView implements View {
     cardholderName: string;
-    expMonth: string;
+    expMonth: string = null;
     expYear: string;
     code: string;
 
     // tslint:disable
-    private _brand: string;
+    private _brand: string = null;
     private _number: string;
     private _subTitle: string;
     // tslint:enable

src/models/view/identityView.ts

@@ -3,7 +3,7 @@ import { View } from './view';
 import { Identity } from '../domain/identity';
 
 export class IdentityView implements View {
-    title: string;
+    title: string = null;
     middleName: string;
     address1: string;
     address2: string;