Don't attempt to start xmobar unless we know its config file exists and don't use hardcoded home directories.
Don't attempt to start xmobar unless we know its config file exists and don't
use hardcoded home directories.

Note: Might also be good to check if xmobar is in the $PATH too.

Wanderfalke/wtftw,nxnfufunezn/wtftw,steveklabnik/wtftw,tempbottle/wtftw,skade/wtftw,Kintaro/wtftw,rowhit/wtftw