mc config missing error checking

[donatello]

Expected behavior

This is just a suggestion/example:

$ mc config get
Invalid sub-command `get`
$ mc config host x
$ Invalid sub-command `x`

Actual behavior

$ mc config get
$ mc config host x
$

Steps to reproduce the behavior

Latest mc

[vadmeste]

mc config is deprecated since a long time @donatello @dhananjaykrutika, it is not visible in mc anymore

[donatello]

It just came up - I accidentally used these commands while thinking of using mc admin config. Maybe we can remove it then.