[grilo-plugins] radiofrance: Don't break when run behind a portal

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 37677190945947dfa6b7f445ca96c01e66e74430
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Mar 31 09:32:45 2014 +0200

    radiofrance: Don't break when run behind a portal
    
    [lua-library] grl-lua-library.c:351: calling source callback function fail (radiofrance_fetch_cb) 
'/home/hadess/Projects/gnome-install/share/grilo-plugins/grl-lua-factory/grl-radiofrance.lua:87: attempt to 
index local 'items' (a nil value)'
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727569

 src/lua-factory/sources/grl-radiofrance.lua |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/lua-factory/sources/grl-radiofrance.lua b/src/lua-factory/sources/grl-radiofrance.lua
index 1776f98..090001e 100644
--- a/src/lua-factory/sources/grl-radiofrance.lua
+++ b/src/lua-factory/sources/grl-radiofrance.lua
@@ -84,6 +84,11 @@ function parse_playlist(playlist, francebleu)
   end
 
   local items = playlist:match('Flux = {.-' .. match1_prefix .. ' : {(.*)}.-}')
+  if not items then
+    grl.callback()
+    return false
+  end
+
   for item in items:gmatch(match2) do
     local media = create_media(item, francebleu)
     if media then