fix issue #828 #837
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fix issue #828 #837
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What this PR does / why we need it?
修复issue #828, JsonObject中加入null值后, 出现冗余逗号的问题
原逻辑是如果不是第一个元素, 就先加一个逗号, 再判断WriteMapNullValue决定是否跳过, 这里如果用户没有WriteMapNullValue的Feature, 则会出现一个空逗号
Summary of your change
将判断Feature的逻辑前置, 不满足条件直接跳过该字段, 避免空逗号问题