bug#33141: 27.0.50; TRAMP simplified syntax doesn't work

[Eli Zaretskii]

> From: Dima Kogan <dima@secretsauce.net>
> Date: Wed, 24 Oct 2018 10:41:47 -0700
> 
> 1. emacs -Q
> 2. (require 'tramp)
> 3. (tramp-change-syntax 'simplified)
> 4. I try to open a file with the simplified syntax
>    - C-x C-f
>    - /localhost:
> 
> I see this:
> 
> tramp-file-name-handler: Wrong type argument: stringp, ""

FWIW, I cannot reproduce this with today's master.

(Do you mean the error message pops up as soon as you type the colon?
If not, what else do you type after the colon?)