Description of problem:
Install and launch liveusb-creator

Version-Release number of selected component:
liveusb-creator-3.11.7-2.fc18

Additional info:
cmdline:        /usr/bin/python -tt /usr/sbin/liveusb-creator
dso_list:       python-libs-2.7.3-13.fc18.x86_64
executable:     /usr/sbin/liveusb-creator
kernel:         3.6.7-5.fc18.x86_64
uid:            1000

Truncated backtrace:
os.py:471:__setitem__:TypeError: must be string, not None

Traceback (most recent call last):
  File "/usr/sbin/liveusb-creator", line 89, in <module>
    main()
  File "/usr/sbin/liveusb-creator", line 82, in main
    from liveusb.gui import LiveUSBApp
  File "/usr/lib/python2.7/site-packages/liveusb/__init__.py", line 29, in <module>
    os.environ['LANG'] = lang
  File "/usr/lib64/python2.7/os.py", line 471, in __setitem__
    putenv(key, item)
TypeError: must be string, not None

Local variables in innermost frame:
item: None
self: {'GNOME_DESKTOP_SESSION_ID': 'this-is-deprecated', 'LESSOPEN': '||/usr/bin/lesspipe.sh %s', 'QT_IM_MODULE': 'xim', 'LOGNAME': 'joel', 'USER': 'joel', 'PATH': '/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/joel/.local/bin:/home/joel/bin', 'XDG_VTNR': '1', 'QTDIR': '/usr/lib64/qt-3.3', 'WINDOWPATH': '1', 'GNOME_KEYRING_CONTROL': '/run/user/1000/keyring-eYmDtJ', 'QTLIB': '/usr/lib64/qt-3.3/lib', 'TERM': 'xterm-256color', 'SHELL': '/bin/bash', 'XAUTHORITY': '/var/run/gdm/auth-for-joel-wnR04Y/database', 'SESSION_MANAGER': 'local/unix:@/tmp/.ICE-unix/1367,unix/unix:/tmp/.ICE-unix/1367', 'QTINC': '/usr/lib64/qt-3.3/include', 'HISTSIZE': '1000', 'WINDOWID': '14680070', 'IMSETTINGS_INTEGRATE_DESKTOP': 'yes', 'GPG_AGENT_INFO': '/run/user/1000/keyring-eYmDtJ/gpg:0:1', 'HOME': '/home/joel', 'USERNAME': 'joel', 'IMSETTINGS_MODULE': 'none', 'XDG_RUNTIME_DIR': '/run/user/1000', 'SSH_AUTH_SOCK': '/run/user/1000/keyring-eYmDtJ/ssh', 'GDMSESSION': 'gnome', 'XMODIFIERS': '@im=none', 'XDG_MENU_PREFIX': 'gnome-', 'QT_GRAPHICSSYSTEM_CHECKED': '1', 'XDG_SESSION_ID': '2', 'DBUS_SESSION_BUS_ADDRESS': 'unix:abstract=/tmp/dbus-Vz5AjPDVMp,guid=b1b8811d96391a035d482df750bfd26b', '_': '/usr/bin/liveusb-creator', 'LANG': 'C', 'DESKTOP_SESSION': 'gnome', 'DISPLAY': ':0', 'GNOME_KEYRING_PID': '1365', 'KRB5CCNAME': 'DIR:/run/user/1000/krb5cc_61ddb79a6f6507936dce676f50bfd250', 'HOSTNAME': 'f18x64', 'GDM_LANG': 'C', 'HISTCONTROL': 'ignoredups', 'SHLVL': '2', 'PWD': '/home/joel', 'COLORTERM': 'gnome-terminal', 'MAIL': '/var/spool/mail/joel', 'LS_COLORS': 'rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.tbz=01;31:*.tbz2=01;31:*.bz=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*.mp3=01;36:*.mpc=01;36:*.ogg=01;36:*.ra=01;36:*.wav=01;36:*.axa=01;36:*.oga=01;36:*.spx=01;36:*.xspf=01;36:', 'XDG_SEAT': 'seat0'}
key: 'LANG'