Comment 2 for bug 1579531

This error is polluting .xsession-errors on yakkety too.

openConnection: connect: No such file or directory
cannot connect to brltty at :0

Glancing at such error , i've found that answer from a Debian dev:

> openConnection: connect: No such file or directory
> cannot connect to brltty at :0

That's no error, they're just debugging messages. They come from xbrlapi which
is trying to connect to a braille display but you have none so it can't. Nothing
to worry about.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=728947

So what is only needed is to silence this debugging message from xbrlapi.
This may affect most of the users, as they does not have use of braille.