[gnome-control-center/gnome-3-34] network: Handle case where GtkComboBox has no active iter

[Robert Ancell <rancell src gnome org>]

commit 1f72d2fd9ce144bb21b233667489ad30c49aae74
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Dec 3 15:43:43 2019 +1300

    network: Handle case where GtkComboBox has no active iter

 panels/network/connection-editor/ce-page-security.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/panels/network/connection-editor/ce-page-security.c 
b/panels/network/connection-editor/ce-page-security.c
index d06e3aeb1..f22954a33 100644
--- a/panels/network/connection-editor/ce-page-security.c
+++ b/panels/network/connection-editor/ce-page-security.c
@@ -99,7 +99,8 @@ security_combo_get_active (CEPageSecurity *page)
         WirelessSecurity *sec = NULL;
 
         model = gtk_combo_box_get_model (page->security_combo);
-        gtk_combo_box_get_active_iter (page->security_combo, &iter);
+        if (!gtk_combo_box_get_active_iter (page->security_combo, &iter))
+                return NULL;
         gtk_tree_model_get (model, &iter, S_SEC_COLUMN, &sec, -1);
 
         return sec;