Busy loop in menus

[Petteri Hintsanen]

Dear gtypist maintainers,

When starting gtypist without terminal input, eg. from a window manager 
by dmenu_run or some other exec mechanism, gtypist goes into a busy loop 
and consequently eats all CPU while running in the background.

This happens because get_widech function returns ERR, but it is not 
checked in cursmenu.c:359 and infoview.c:274.

Simple patch against current git master attached for your consideration. 
 It may not be the best solution overall, but should fix the immediate 
problem.

This is on GNU/Linux machine running X11 (Xorg) and fvwm.  In fvwm's 
environment, TERM is set to "linux".

Thanks,
Petteri

get_widech.patch
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