code: def get_next_step(self, step=None):
          
          if step is None:
              step = self.steps.current
          form_list = self.get_form_list()
          key = form_list.keyOrder.index(step) + 1
          if len(form_list.keyOrder) > key:
              return form_list.keyOrder[key]
          return None
docs: Returns the next step after the given `step`. If no more steps are
          available, None will be returned. If the `step` argument is None, the
          current step will be determined automatically.