variable is not null if used optstring json object

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1/** Return the value mapped by the given key, or {@code null} if not present or null. */
2public static String optString(JSONObject json, String key)
3{
4    // http://code.google.com/p/android/issues/detail?id=13830
5    if (json.isNull(key))
6        return null;
7    else
8        return json.optString(key, null);
9}

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