Bug#342820: gtetrinet crash reproducible

[Justin Pryzby]

gtetrinet crashes on startup for a new user, specifically when
.gconf/apps/gtetrinet/ doesn't exist.

I can crash it 100% of the time with:

killall gconfd-2; rm ./.gconf/apps/gtetrinet/%gconf.xml; gtetrinet;

#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d52723 in __waitpid_nocancel () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7f402db in libgnomeui_module_info_get () from /usr/lib/libgnomeui-2.so.0
#3  <signal handler called>
#4  0xb7cfa341 in gnome_url_error_get_type () from /usr/lib/libgnome-2.so.0
#5  0xb7cfb43b in gnome_config_sync () from /usr/lib/libgnome-2.so.0
#6  0xb7cfbdbd in gnome_config_get_bool_with_default_ ()
   from /usr/lib/libgnome-2.so.0
#7  0xb7cfbe06 in gnome_config_get_string_with_default_ ()
   from /usr/lib/libgnome-2.so.0
#8  0x08052492 in config_loadtheme ()
#9  0x080531b5 in config_loadconfig ()
#10 0x0805ac13 in main ()