fix: handleFormValues 不再将所有空字符串转换为undefined #3496
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handleFormValues 在获取 fields 时调用，判断字段为空字符串时会转换为 undefined，但这样就无法将有内容的字符串修改为空字符串值，因为 json 序列化会忽略 undefined 字段
之前这里的修改是 为了重置表单时移除URL中的参数 #2559
在 resetFields 里调用的 getDefaultValue 里把 input 默认值设置为 undefined 一样可以实现