[mutter/gnome-3-28] monitor-manager: Don't throw an error if UPower isn't running

[Marco Trevisan <marcotrevi src gnome org>]

commit 15f01174ff9d4b539fe125e219f269943f02993a
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Apr 16 08:54:08 2018 +0000

    monitor-manager: Don't throw an error if UPower isn't running
    
    Don't try to connect to a UpClient signal if creating the client failed,
    because UPower isn't running for example.
    
    
    (cherry picked from commit 644a618fb15d90056107bc4e1fbd7397f17219a8)

 src/backends/meta-monitor-manager.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index c4c1db5ed..edfa1f64d 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -733,8 +733,11 @@ meta_monitor_manager_constructed (GObject *object)
   if (manager_class->is_lid_closed == meta_monitor_manager_real_is_lid_closed)
     {
       manager->up_client = up_client_new ();
-      g_signal_connect_object (manager->up_client, "notify::lid-is-closed",
-                               G_CALLBACK (lid_is_closed_changed), manager, 0);
+      if (manager->up_client)
+        {
+          g_signal_connect_object (manager->up_client, "notify::lid-is-closed",
+                                   G_CALLBACK (lid_is_closed_changed), manager, 0);
+        }
     }
 
   g_signal_connect_object (manager, "notify::power-save-mode",