fix(core): deconstruct field cache value write back

[panyu97py]

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---

What have you changed?

修复在使用 JsonSchema 解构 key 时，数据回写为空的问题

//  表单实例
const form = createForm();

const schema = {
  a: {
    type: 'number',
    title: 'demo',
    'x-decorator': FormItem,
    'x-component': Radio.Group,
    'x-component-props': {
      options: [
        { label: '是', value: true },
        { label: '否', value: false },
      ],
    },
  },
  '{b,c}': {
    type: 'number',
    title: 'demo',
    'x-decorator': FormItem,
    'x-component': (props) => {
      const { value } = props;
      return (
        <div>
          <div>b:{value.b}</div>
          <div>c:{value.c}</div>
        </div>
      );
    },
    'x-reactions': (field: Field) => {
      const a = field.query('a').value();
      field.visible = Boolean(a);
    },
  },
};

const Demo = () => {
  useEffect(() => {
    setTimeout(()=>form.setValues({ a: true, b: 2, c: 3 }),500)
  }, []);

  return (
    <FormProvider form={form}>
      <SchemaField schema={billingInfoSchema} />
    </FormProvider>
  );
};

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[janryWang]

这个修复是个 break change 哈，之前都是基于 undefined 进行判断的，现在改成空值判断，空值其实不稳定的

[panyu97py]

这个修复是个 break change 哈，之前都是基于 undefined 进行判断的，现在改成空值判断，空值其实不稳定的

解构赋值取值时这里的 value 是空对象，空对象不等于 undefined 会使JsonSchema 解构 key 时，数据回写为空。目前在项目中patch 修复并稳定运行建议使用demo试试