Minimum character limit for slash command autocomplete

[ddugovic]

I'm using a 3rd party autocomplete API which has a minimum character limit of 3 characters (to complete player usernames of the 3rd party site).

Currently a user typing less than 3 characters observes a misleading error message (as opposed to "more input required"):

[Zoddo]

There is not a 100% ideal solution, but a common one is to return a single entry saying something like
Error: You need to type at least 3 characters.