[libdazzle] properties-group: handle NULL object from weak ref

[Christian Hergert <chergert src gnome org>]

commit e91912420101a9f0150f4cd622fce1fdf474061b
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jul 7 02:40:19 2017 -0700

    properties-group: handle NULL object from weak ref

 src/actions/dzl-properties-group.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/src/actions/dzl-properties-group.c b/src/actions/dzl-properties-group.c
index 2b995d0..8087a46 100644
--- a/src/actions/dzl-properties-group.c
+++ b/src/actions/dzl-properties-group.c
@@ -162,7 +162,12 @@ dzl_properties_group_query_action (GActionGroup        *group,
             *state_hint = NULL;
 
           if (state)
-            *state = get_action_state (object, mapping);
+            {
+              if (object)
+                *state = get_action_state (object, mapping);
+              else
+                *state = NULL;
+            }
 
           return TRUE;
         }