code: def get_next_step(self):
          
          subcategory = self.parent.step_kw_subcategory.selected_subcategory()
          if subcategory and subcategory.get('extra_keywords'):
              new_step = self.parent.step_kw_extra_keywords
          else:
              new_step = self.parent.step_kw_title
          return new_step
docs: Find the proper step when user clicks the Next button.
  
          :returns: The step to be switched to
          :rtype: WizardStep instance or None