[evolution/gtk3] Fix et_set_property runtime warnings on close

[Milan Crha <mcrha src gnome org>]

commit 1abdc7db57e38fdc436d378ede576865754877bd
Author: Milan Crha <mcrha redhat com>
Date:   Mon Jan 24 11:22:16 2011 +0100

    Fix et_set_property runtime warnings on close

 widgets/table/e-tree.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/widgets/table/e-tree.c b/widgets/table/e-tree.c
index 1e192da..8dbda3d 100644
--- a/widgets/table/e-tree.c
+++ b/widgets/table/e-tree.c
@@ -1995,7 +1995,9 @@ et_set_property (GObject *object,
 {
 	ETree *etree = E_TREE (object);
 
-	g_return_if_fail (etree->priv);
+	/* values for GtkScrollable interface can be set after dispose call, thus ignore it */
+	if (!etree->priv)
+		return;
 
 	switch (prop_id) {
 	case PROP_LENGTH_THRESHOLD: