Returns serializer for specific element.

        :Args:
          - node (:class:`ooxml.doc.Element`): Element object 

        :Returns:
          Returns reference to a function which will be used for serialization.

def get_serializer(self, node):
        """Returns serializer for specific element.

        :Args:
          - node (:class:`ooxml.doc.Element`): Element object 

        :Returns:
          Returns reference to a function which will be used for serialization.
        """

        return self.options['serializers'].get(type(node), None)

        if type(node) in self.options['serializers']:
            return self.options['serializers'][type(node)]

        return None