def remove_constituency_layer(self):
        """
        Removes the constituency layer (if exists) of the object (in memory)
        """
        if self.constituency_layer is not None:
            this_node = self.constituency_layer.get_node()
            self.root.remove(this_node)
        if self.header is not None:
            self.header.remove_lp('constituents')
Removes the constituency layer (if exists) of the object (in memory)