Confluent help should say something on non-existing commands

[gwenshap]

If I try to get help for a command that doesn't exist ("confluent connect help"), currently there is no output. Will be nice to get some error like "git: 'connect' is not a git command. See 'git --help'."

[kkonstantine]

When I try it, I see that running confluent with an unknown command (or subcommand) will give an error message. For instance running:
confluent connect help as above gives:

Unknown subcommand 'connect help'. Type 'confluent help connect' for a list of available subcommands.

Adding "guessing feature" with an edit distance algorithm is on the todo list. Same for auto-completion.

[gwenshap]

I wrote it this way:

ubuntu@ip-172-31-73-209:~$ confluent help connect

There is no output

[kkonstantine]

Indeed. A message for running help on a non-existent command is missing.