code: def download_report_as_file_with_awql(report_query, format, path, cid = nil)
        report_body = download_report_with_awql(report_query, format, cid)
        save_to_file(report_body, path)
        return nil
      end
docs: Downloads a report with AWQL and saves it to a file.
  
   Args:
   - report_query: query for the report as string
   - format: format for the report as string
   - path: path to save report to
   - cid: optional customer ID to run report against
  
   Returns:
   - nil
  
   Raises:
   - AdwordsApi::Errors::ReportError if server-side error occurred