code: def check_for_xml_error(report_body, response_code)
        unless report_body.nil?
          error_response = get_nori().parse(report_body)
          if error_response.include?(:report_download_error) and
              error_response[:report_download_error].include?(:api_error)
            api_error = error_response[:report_download_error][:api_error]
            raise AdwordsApi::Errors::ReportXmlError.new(response_code,
                api_error[:type], api_error[:trigger], api_error[:field_path])
          end
        end
      end
docs: Checks for an XML error in the response body and raises an exception if
   it was found.