[gnome-control-center] network: Don't warn when setting empty IPv4 gateway

[Bastien Nocera <hadess src gnome org>]

commit c50d1adb0ff3b1a9e9d6ae682cc4b7461424794a
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Feb 6 11:11:56 2018 +0100

    network: Don't warn when setting empty IPv4 gateway
    
    Set an empty string when there's no IPv4 gateway rather than warn.

 panels/network/connection-editor/ce-page-ip4.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/network/connection-editor/ce-page-ip4.c b/panels/network/connection-editor/ce-page-ip4.c
index 0f34f6f..400dc43 100644
--- a/panels/network/connection-editor/ce-page-ip4.c
+++ b/panels/network/connection-editor/ce-page-ip4.c
@@ -394,7 +394,7 @@ add_route_row (CEPageIP4   *page,
         g_signal_connect_swapped (widget, "changed", G_CALLBACK (ce_page_changed), page);
         g_signal_connect_swapped (widget, "activate", G_CALLBACK (ensure_empty_routes_row), page);
         g_object_set_data (G_OBJECT (row), "gateway", widget);
-        gtk_entry_set_text (GTK_ENTRY (widget), gateway);
+        gtk_entry_set_text (GTK_ENTRY (widget), gateway ? gateway : "");
         gtk_entry_set_width_chars (GTK_ENTRY (widget), 16);
         gtk_widget_set_hexpand (widget, TRUE);
         gtk_container_add (GTK_CONTAINER (row_box), widget);