JsonApi: use default constructor for QJsonObject for Qt5.3 compatibility
JsonApi: use default constructor for QJsonObject for Qt5.3 compatibility

enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server,raoulh/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server