docs: def __has_next_page(self, current_page_num=0):
          """ this is an example for debug purpose only...
          """
          try:
              next_page = self.robot.get_elements(
                  self.base.get('next_page'),
                  multiple=True
              )
              log.debug('<Site> has {} next page elems'.format(len(next_page)))
              if not next_page:
                  return False
              for i, ele in enumerate(next_page):
                  if ele.get_attribute('innerText') == 'Next':
                      log.debug('<Site> {} is the right link'.format(i))
                      self.next_page = ele
                      break
              return True
          except Exception as _:
              self.next_page = None
              return False