[empathy/gnome-2-30] protocol-chooser: return NULL if for some reason we can't find the procol any more

[Guillaume Desmottes <gdesmott src gnome org>]

commit 328cdf4c7520b1526b1aac245791f1e97be2d3a5
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Thu Apr 15 17:19:56 2010 +0200

    protocol-chooser: return NULL if for some reason we can't find the procol any more
    
    This could eventually happen if a CM claims to support a protocol in its
    manager file but actually don't. Should fix #61582

 libempathy-gtk/empathy-protocol-chooser.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/libempathy-gtk/empathy-protocol-chooser.c b/libempathy-gtk/empathy-protocol-chooser.c
index 72eb055..9f57d92 100644
--- a/libempathy-gtk/empathy-protocol-chooser.c
+++ b/libempathy-gtk/empathy-protocol-chooser.c
@@ -497,6 +497,14 @@ empathy_protocol_chooser_dup_selected (
             tp_connection_manager_get_protocol (cm, protocol_name);
 
           g_free (protocol_name);
+
+          if (*protocol == NULL)
+            {
+              /* For some reason the CM doesn't know about this protocol
+               * any more */
+              g_object_unref (cm);
+              return NULL;
+            }
         }
 
       if (is_gtalk != NULL)