[gnome-settings-daemon] sharing: Fix crash when run against older NM

[Bastien Nocera <hadess src gnome org>]

commit d192314efbf4f0de0935ad2d656d7438b6872526
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Aug 6 11:18:52 2014 +0200

    sharing: Fix crash when run against older NM
    
    When run against an older version of NetworkManager,
    nm_active_connection_get_connection_type() will return NULL as the
    library supports the function, but the property doesn't exist in the
    daemon.
    
    Consider the sharing to be offline if the version of NetworkManager is
    too old.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732479

 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 dde28f5..c932908 100644
--- a/plugins/sharing/gsd-sharing-manager.c
+++ b/plugins/sharing/gsd-sharing-manager.c
@@ -596,6 +596,8 @@ primary_connection_changed (GObject    *gobject,
                 manager->priv->current_network = g_strdup (nm_active_connection_get_uuid (a_con));
                 manager->priv->current_network_name = g_strdup (nm_active_connection_get_id (a_con));
                 manager->priv->carrier_type = g_strdup (nm_active_connection_get_connection_type (a_con));
+                if (manager->priv->carrier_type == NULL)
+                        manager->priv->carrier_type = g_strdup ("");
         } else {
                 manager->priv->current_network = g_strdup ("");
                 manager->priv->current_network_name = g_strdup ("");
@@ -604,6 +606,9 @@ primary_connection_changed (GObject    *gobject,
 
         if (!a_con) {
                 manager->priv->sharing_status = GSD_SHARING_STATUS_OFFLINE;
+        } else if (*(manager->priv->carrier_type) == '\0') {
+                /* Missing carrier type information? */
+                manager->priv->sharing_status = GSD_SHARING_STATUS_OFFLINE;
         } else if (g_str_equal (manager->priv->carrier_type, "bluetooth") ||
                    g_str_equal (manager->priv->carrier_type, "gsm") ||
                    g_str_equal (manager->priv->carrier_type, "cdma")) {