code: def check_existing_results(self, benchmark):
          
          if os.path.exists(benchmark.log_folder):
              sys.exit('Output directory {0} already exists, will not overwrite existing results.'.format(benchmark.log_folder))
          if os.path.exists(benchmark.log_zip):
              sys.exit('Output archive {0} already exists, will not overwrite existing results.'.format(benchmark.log_zip))
docs: Check and abort if the target directory for the benchmark results
          already exists in order to avoid overwriting results.