[gnome-control-center/benzea/display-more-error-handling: 2/2] display: Add guards for NULL display configuration

[Benjamin Berg <bberg src gnome org>]

commit 5c1470feec39cb49a4a7c2639338497fa23c4263
Author: Benjamin Berg <bberg redhat com>
Date:   Wed Jul 3 09:53:38 2019 +0200

    display: Add guards for NULL display configuration
    
    This may happen under some conditions. Possibly due to a race condition
    (i.e. we did not receive any configuration from mutter yet) or also if
    we are not running on GNOME.
    
    Add guards for NULL configuration. This configuration is never
    applicable and mostly clears the UI.
    
    Fixes: #604

 panels/display/cc-display-panel.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
index b15a774f3..6e8375e02 100644
--- a/panels/display/cc-display-panel.c
+++ b/panels/display/cc-display-panel.c
@@ -745,6 +745,11 @@ rebuild_ui (CcDisplayPanel *panel)
   g_list_store_remove_all (panel->primary_display_list);
   gtk_list_store_clear (panel->output_selection_list);
 
+  if (!panel->current_config) {
+    panel->rebuilding_counter--;
+    return;
+  }
+
   n_active_outputs = 0;
   n_usable_outputs = 0;
   outputs = cc_display_config_get_ui_sorted_monitors (panel->current_config);
@@ -986,6 +991,12 @@ update_apply_button (CcDisplayPanel *panel)
   gboolean config_equal;
   g_autoptr(CcDisplayConfig) applied_config = NULL;
 
+  if (!panel->current_config)
+    {
+      reset_titlebar (panel);
+      return;
+    }
+
   applied_config = cc_display_config_manager_get_current (panel->manager);
 
   config_equal = cc_display_config_equal (panel->current_config,