怎么配置返回null的字段

可以修改 [JSON](https://gitee.com/Tencent/APIJSON/blob/master/APIJSONORM/src/main/java/apijson/JSON.java).toJSONString 或 [AbstractParser](https://gitee.com/Tencent/APIJSON/blob/master/APIJSONORM/src/main/java/apijson/orm/AbstractParser.java).parse 的源码，为 toJSONString 传入 fastjson 的参数 SerializerFeature.WriteMapNullValue

但不建议，因为设置后某些情况下会导致对象甚至数组中多出来一些无效值：

```js
{
    "[]": [
        {
            "Moment": {
                "id": 12,
                "userId": 70793,
                "date": "2017-02-08 08:06:11.0",
                "content": "APIJSON,let interfaces and documents go to hell !",
                "praiseUserIdList": [
                    70793,
                    93793,
                    82044
                ],
                "pictureList": [
                    "http://static.oschina.net/uploads/img/201604/22172508_eGDi.jpg"
                ]
            },
            "User": {
                "id": null,
                "name": null,
                "head": null
            },
            "Comment[]": [
                {
                    "id": 162,
                    "toId": 0,
                    "userId": 93793,
                    "momentId": 12,
                    "date": "2017-03-06 05:03:45.0",
                    "content": "This is a Content...-162"
                },
                null
            ]
        },
        null
    ],
    "ok": true,
    "msg": "success",
    "code": 200
}

```

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