配置单个config报错

[hxu-aa]

如果电脑没有外置键盘（不足两个键盘的情况），配置一个一会报错。
命令：kofconfig -p1 JKLIZXVC
结果：

Traceback (most recent call last):
File "/usr/local/bin/kofconfig", line 11, in
sys.exit(main())
File "/usr/local/lib/python2.7/site-packages/kofconfig.py", line 197, in main
config(keys_p1=p1, keys_p2=p2)
File "/usr/local/lib/python2.7/site-packages/kofconfig.py", line 167, in config
mulit_kbd = is_using_multiple_keyboard()
File "/usr/local/lib/python2.7/site-packages/kofconfig.py", line 69, in is_using_multiple_keyboard
['grep', '-i', 'keyboard'], stdin=usb_info.stdout)
File "/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 573, in check_output
raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['grep', '-i', 'keyboard']' returned non-zero exit status 1

[mitnk]

fixed ;)