Check has unknown attachment error on page
        :param page_id:
        :return:

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 ""