docs: 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