message: Print errors if --outfile or --outtree are not passed to the tf_upgrade_v2.py
  script.
diff: @@ -120,10 +120,18 @@ Simple usage:
  report_filename = args.report_filename
  files_processed = 0
  if args.input_file:
  + if not args.output_file:
  + raise ValueError(
  + "--outfile=<output file> argument is required when converting a "
  + "single file.")
  files_processed, report_text, errors = upgrade.process_file(
  args.input_file, args.output_file)
  files_processed = 1
  elif args.input_tree:
  + if not args.output_tree:
  + raise ValueError(
  + "--outtree=<output directory> argument is required when converting a "
  + "file tree.")
  files_processed, report_text, errors = upgrade.process_tree(
  args.input_tree, args.output_tree, args.copy_other_files)
  else:
  