[gegl] Don't try to read props of NULL node->operation

[Daniel Sabo <daniels src gnome org>]

commit e6cc10d11af4c87fd4e27099fcbb06a41065612c
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Thu Jun 6 22:27:53 2013 -0700

    Don't try to read props of NULL node->operation

 gegl/graph/gegl-node.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/gegl/graph/gegl-node.c b/gegl/graph/gegl-node.c
index 068c0ec..fba9b2a 100644
--- a/gegl/graph/gegl-node.c
+++ b/gegl/graph/gegl-node.c
@@ -1273,7 +1273,7 @@ gegl_node_set_valist (GeglNode    *self,
             {
               object = G_OBJECT (self);
             }
-          else
+          else if (self->operation)
             {
               pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (self->operation),
                                                     property_name);
@@ -1362,7 +1362,8 @@ gegl_node_set_property (GeglNode     *self,
       return;
     }
 
-  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (self->operation), property_name);
+  if (self->operation)
+    pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (self->operation), property_name);
   if (pspec)
     {
       if (G_IS_PARAM_SPEC_ENUM (pspec) && G_VALUE_HOLDS (value, G_TYPE_STRING))
@@ -1423,7 +1424,8 @@ gegl_node_get_property (GeglNode    *self,
       return;
     }
 
-  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (self->operation), property_name);
+  if (self->operation)
+    pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (self->operation), property_name);
   if (pspec)
     {
       if (!G_IS_VALUE (value))