Description of problem:
Hi,
I've found unpeasant problem, I've had created some printers (not important, it is enought to have any) I found it whne testing bug
https://bugzilla.redhat.com/show_bug.cgi?id=642448
using ASCII as an enconfing of chars causes that nothing is writen to stdout
(for me it seems that cups somewhere match ASCII string and then go thru another way) 

Version-Release number of selected component (if applicable):
# rpm -qa cups\*
cups-1.4.2-39.el6.x86_64
cups-libs-1.4.2-39.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. service cups start
2. install any printers 
3. LANG=en_US.ASCII lpstat -h localhost -s
  
Actual results:
==nothing on output==

Expected results:
no system default destination
device for file: /tmp/xxxxx.out
device for tofile: socket://localhost:12000

Additional info:
any other string for enconding provide same proper output:
# lpstat -h x86-64-v02 -s
# LANG=en_US.ISO-8859-1 lpstat -h x86-64-v02 -s
# LANG=en_US.US-ASCII lpstat -h x86-64-v02 -s
# LANG=en_US.SSS lpstat -h x86-64-v02 -s
# LANG=uss.enterprise lpstat -h x86-64-v02 -s

strace ends with:
open("/usr/share/cups/charmaps/us-ascii.txt", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/cups/charmaps/us-ascii.txt", O_RDONLY) = -1 ENOENT (No such file or directory)
exit_group(0)                           = ?