[gegl] gegl:gegl clear error message between invocations

[Øyvind Kolås <ok src gnome org>]

commit afc7c20d115ab84e77f33dd02f3b38c64ac68f68
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Apr 16 00:12:09 2016 +0100

    gegl:gegl clear error message between invocations

 operations/common/gegl.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/operations/common/gegl.c b/operations/common/gegl.c
index 6218438..3a7a36a 100644
--- a/operations/common/gegl.c
+++ b/operations/common/gegl.c
@@ -84,12 +84,12 @@ prepare (GeglOperation *operation)
 
   if (error)
   {
-    gegl_node_set (gegl, "error", error->message, NULL);
     g_object_set (operation, "error", error->message, NULL);
-    //g_object_notify (operation, "error");
     g_error_free (error);
     error = NULL;
   }
+  else
+    g_object_set (operation, "error", "", NULL);
   /*
   gegl_operation_meta_redirect (operation, "scale", multiply, "value");
   gegl_operation_meta_redirect (operation, "std-dev", blur, "std-dev-x");