[gnome-settings-daemon] sharing: Avoid a crash if we can't find the service desktop file

[Rui Matos <rtcm src gnome org>]

commit 42bec6848e66cc6e9d7420aff4eae02b25259d29
Author: Rui Matos <tiagomatos gmail com>
Date:   Tue Jun 24 15:16:43 2014 +0200

    sharing: Avoid a crash if we can't find the service desktop file

 plugins/sharing/gsd-sharing-manager.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/plugins/sharing/gsd-sharing-manager.c b/plugins/sharing/gsd-sharing-manager.c
index a171a51..046a8a6 100644
--- a/plugins/sharing/gsd-sharing-manager.c
+++ b/plugins/sharing/gsd-sharing-manager.c
@@ -114,6 +114,11 @@ gsd_sharing_manager_start_service (GsdSharingManager *manager,
         app = g_desktop_app_info_new (desktop);
         g_free (desktop);
 
+        if (!app) {
+                g_warning ("Could not find desktop file for service '%s'", service->name);
+                return;
+        }
+
         exec = g_app_info_get_commandline (G_APP_INFO (app));
         g_object_unref (app);