docs: def has_unknown_attachment_error(self, page_id):
          """
          Check has unknown attachment error on page
          :param page_id:
          :return:
          """
          unknown_attachment_identifier = 'plugins/servlet/confluence/placeholder/unknown-attachment'
          result = self.get_page_by_id(page_id, expand='body.view')
          if len(result) == 0:
              return ""
          body = (((result.get('body') or {}).get('view') or {}).get('value') or {})
          if unknown_attachment_identifier in body:
              return result.get('_links').get('base') + result.get('_links').get('tinyui')
          return ""