Bug#320232: xmodmap: print error if no "-" and stdin has stuff

[Dan Jacobson <jidanni@jidanni.org>]

Package: xbase-clients
Version: 4.3.0.dfsg.1-13
Severity: wishlist
File: /usr/X11R6/bin/xmodmap

One notes the man page doesn't explicitly say
$ xmodmap
with no options will print the present state.
It just says "The xmodmap program is used to edit and display"...

But what was mainly bugging me was xmodmap acts like all is hunky dory
if one forgets the "-" meaning stdin.

$ echo ANYBODY HOME?|xmodmap|sum; echo $?
33830     1
0
$ xmodmap|sum; echo $?
33830     1
0

I wish it would print an error.