fix(simple form iterator): defaulted values to null instead of empty string

Author: Krzysztof Marek Witkowski

packages/ra-core/src/form/FormDataConsumer.spec.tsx

@@ -1,5 +1,6 @@
 import * as React from 'react';
 import { render, waitFor, screen, fireEvent } from '@testing-library/react';
+
 import FormDataConsumer, { FormDataConsumerView } from './FormDataConsumer';
 import { testDataProvider } from '../dataProvider';
 import {