[libdazzle] properties-group: fix warning message

[Christian Hergert <chergert src gnome org>]

commit 77575fd58f54e054cd8a73747b9968bbd74dbf8d
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jul 7 02:12:22 2017 -0700

    properties-group: fix warning message

 src/actions/dzl-properties-group.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/actions/dzl-properties-group.c b/src/actions/dzl-properties-group.c
index d2baf5c..9cb26c2 100644
--- a/src/actions/dzl-properties-group.c
+++ b/src/actions/dzl-properties-group.c
@@ -664,7 +664,8 @@ dzl_properties_group_add_property (DzlPropertiesGroup *self,
 
   if (pspec == NULL)
     {
-      g_warning ("No such property \"%s\", property_name", property_name);
+      g_warning ("No such property \"%s\" on type %s",
+                 property_name, G_OBJECT_TYPE_NAME (object));
       return;
     }