Initialize values in jsoncpp. #1200
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Due do compiling json with -Werrro, g++ (Debian 14.2.0-19) 14.2.0 fails with "warning: '(Json::Value::ValueHolder)this' is used uninitialized". The default constructor uses nullValue to initialize the Value without a value. When calling method swapPayload() with such an object, the uninitialized internal value gets accessed. As a simple workaround set new Value objects to integer 0.