[empathy] start_gnome_contacts: make sure individual is valid

[Guillaume Desmottes <gdesmott src gnome org>]

commit c9c63f5412fbf6f7927c857c7f8f04082abbccde
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Fri Feb 10 12:58:38 2012 +0100

    start_gnome_contacts: make sure individual is valid

 libempathy-gtk/empathy-individual-menu.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libempathy-gtk/empathy-individual-menu.c b/libempathy-gtk/empathy-individual-menu.c
index 293647a..7b8da52 100644
--- a/libempathy-gtk/empathy-individual-menu.c
+++ b/libempathy-gtk/empathy-individual-menu.c
@@ -1311,6 +1311,8 @@ start_gnome_contacts (FolksIndividual *individual,
   GdkAppLaunchContext *context = NULL;
   GdkDisplay *display;
 
+  g_return_if_fail (FOLKS_IS_INDIVIDUAL (individual));
+
   /* Start gnome-contacts */
   display = gdk_display_get_default ();
   context = gdk_display_get_app_launch_context (display);