Fix double free of Node2Scalar
It seems that a Node2Scalar is deleted by the element which reads it. So, it must not be deleted by a static destructor.
A causa di un intervento di manutenzione il servizio non sarà disponibile il 17/05 dalle 08:30 alle 18:30 (CEST) - The Gitlab service will not be available on May 17th from 08:30 to 18:30 (CEST)
It seems that a Node2Scalar is deleted by the element which reads it. So, it must not be deleted by a static destructor.