docs: def get_absolute_url(self):
          """
          It returns absolute url defined by node related to this page
          """
          try:
              node = Node.objects.select_related().filter(page=self)[0]
              return node.get_absolute_url()
          except Exception, e:
              raise ValueError(u"Error in {0}.{1}: {2}".format(self.__module__, self.__class__.__name__, e))
              return u""