Different return code for unknown (sub)command

[albttx]

link with: #706

• An unknown command return 1
• An unknown subcommand return 0

$ ./test baz ; echo $?
unknown command "baz" for "./test"
1

$ ./test foo unkown ; echo $?
Usage:
  test foo [command]

Available Commands:
  bar         
  baz         

Flags:
  -h, --help   help for foo

Use "test foo [command] --help" for more information about a command.
0 # <- It's should be 1

[github-actions]

This issue is being marked as stale due to a long period of inactivity