Add a function cJSON_IsEmpty() about cjson HOT 4 OPEN

I think you can just call cJSON_IsArray or cJSON_IsObject without having to look into the cJSON structure yourself and read child. These functions both return false if the item passed is NULL.

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Hi @mbratch,
sorry for the confusion, but I'm not interested in finding if the item is NULL.
I need to detect if it points to an empty json object {} or empty json array [].

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@escherstair I see thanks for clarifying, I misunderstood.

I suppose it may be an application-specific need. If it were a common pattern in my application, I'd just write my own little function for it.

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If you think it's not a general use case, for me it's ok going on witth the little custom function I wrote.

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