From d21b00c767b6f4c3c5f54982565ef2bb9e846f41 Mon Sep 17 00:00:00 2001
From: marty <martin_grenfell@msn.com>
Date: Wed, 2 Sep 2009 16:42:24 +1200
Subject: [PATCH] fix bug when using x on the tree root

patch from Bryan Venteicher
---
 plugin/NERD_tree.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index fdb0d0d..632042d 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -3546,7 +3546,7 @@ function! s:closeCurrentDir()
     endif
 
     let parent = treenode.parent
-    if parent.isRoot()
+    if parent ==# {} || parent.isRoot()
         call s:echo("cannot close tree root")
     else
         call treenode.parent.close()