[gnome-control-center] network: Fix VPN UI not showing up

[Bastien Nocera <hadess src gnome org>]

commit 7adfaf1ed95fe87e9b086ce890aea152efcc5e44
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Jun 13 18:36:41 2016 +0200

    network: Fix VPN UI not showing up
    
    The VPN editor API changed as well.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767614

 panels/network/connection-editor/ce-page-vpn.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/panels/network/connection-editor/ce-page-vpn.c b/panels/network/connection-editor/ce-page-vpn.c
index 56cba07..533aa8b 100644
--- a/panels/network/connection-editor/ce-page-vpn.c
+++ b/panels/network/connection-editor/ce-page-vpn.c
@@ -94,7 +94,13 @@ load_vpn_plugin (CEPageVpn *page, NMConnection *connection)
        CEPage *parent = CE_PAGE (page);
         GtkWidget *ui_widget, *failure;
 
-       ui_widget = GTK_WIDGET (nm_vpn_editor_get_widget (page->editor));
+        page->editor = nm_vpn_editor_plugin_get_editor (page->plugin,
+                                                        connection,
+                                                        NULL);
+        ui_widget = NULL;
+        if (page->editor)
+                ui_widget = GTK_WIDGET (nm_vpn_editor_get_widget (page->editor));
+
        if (!ui_widget) {
                g_clear_object (&page->editor);
                 page->plugin = NULL;