Return object for given name registered in System namespace.

def name_to_system_object(self, value):
        """
        Return object for given name registered in System namespace.
        """
        if not self.system:
            raise SystemNotReady

        if isinstance(value, (str, Object)):
            rv = self.system.name_to_system_object(value)
            return rv if rv else value
        else:
            return value