Created attachment 253686 [details] [review]
handle null country code for Esperanto

code: panels/region/cc-input-chooser.c (For version 3.8.3)
segfault line: 1075
   list = gnome_xkb_info_get_layouts_for_country (priv->xkb_info, country_code);

Explanation:
Debian comes with locales including:

 $ cat /usr/share/i18n/SUPPORTED
...
en_ZW ISO-8859-1
eo.UTF-8 UTF-8
eo ISO-8859-3
es_AR.UTF-8 UTF-8
es_AR ISO-8859-1
...

This "eo" for Esperanto naturally has no country code and causes panels/region/cc-input-chooser.c to segfaults when, for example, I try to set input source for the keyboard.  (Also this prevented ibus to function)

== Error seen when gnome-control-center is run from console ==

(gnome-control-center:29342): GnomeDesktop-WARNING **: locale
'eo_(null).utf8' isn't valid

(gnome-control-center:29342): GnomeDesktop-WARNING **: locale
'eo_(null).utf8' isn't valid

(gnome-control-center:29342): GnomeDesktop-WARNING **: locale
'eo_(null).utf8' isn't valid

(gnome-control-center:29342): GnomeDesktop-CRITICAL **:
gnome_get_country_from_code: assertion 'code != NULL' failed

 ======

Although null happens for country_code on Debian, I thought it is more prudent to protect this program from crash for NULL language_code.  

Attached patch should prevent segfault.

See more on http://bugs.debian.org/692453 for more.