add null value as default to onVerify

app/src/frontend/building/data-components/verification.tsx

@@ -24,6 +24,7 @@ class Verification extends Component<VerificationProps, any> {
             e.preventDefault();
             const x = e.clientX / document.body.clientWidth;
             const y = e.clientY / document.body.clientHeight;
+            const value = null;
             this.props.onVerify(this.props.slug, verify, x, y);
         }
     }