[anjal] BUGFIX: GNOME Bug #605785 - Segfault when dragging an empty list

[Yan Li <yanli src gnome org>]

commit 15068540e7e4f14cc3e653a40a5a0ed1c482e1ea
Author: Yan Li <yanli infradead org>
Date:   Thu Jan 21 14:10:20 2010 +0800

    BUGFIX: GNOME Bug #605785 - Segfault when dragging an empty list

 src/em-tree-store.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/em-tree-store.c b/src/em-tree-store.c
index 7181293..f2c9bc9 100644
--- a/src/em-tree-store.c
+++ b/src/em-tree-store.c
@@ -1,3 +1,4 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
 /*
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -42,7 +43,7 @@
 
 #define _PRIVATE(x) (g_type_instance_get_private((GTypeInstance *)(x), em_tree_store_get_type()))
 
-#define node_has_children(node) ((node->flags & EM_TREE_NODE_LEAF) == 0 && node->children.head != (EDListNode *)&node->children.tail)
+#define node_has_children(node) ((node) && (node->flags & EM_TREE_NODE_LEAF) == 0 && node->children.head != (EDListNode *)&node->children.tail)
 static time_t emts_thread_time (EMTreeStore *emts, EMTreeNode *node, char **);
 static gboolean emts_thread_unread (EMTreeStore *emts, EMTreeNode *node);
 static void emts_prune_empty(EMTreeStore *emts, EMTreeNode *node);