more TERM breakage [screen, gnome-terminal]

[Bill Nottingham]

Hans de Goede (j.w.r.degoede at hhs.nl) said: 
> So after reading man bash it should be:
> if [ "$PS1" ]; then
>     case $TERM in
>         xterm* | rxvt* | gnome | konsole)
>                 if [ -e /etc/sysconfig/bash-prompt-xterm ]; then
>                         PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm
>                 else
>                 PROMPT_COMMAND='echo -ne "\033]0;${USER}@${ ....
>                 fi
>                 ;;

Obviously it should just test the terminal capablity for prompt setting.

Except there isn't one (at least, not that's used.)

Bill