From f2e547c657d3de87408a887a34ca38c3657f2b9f Mon Sep 17 00:00:00 2001
From: Dan Davison <davison@stats.ox.ac.uk>
Date: Wed, 20 Oct 2010 21:45:04 +0100
Subject: [PATCH] babel: Fix check for zero length sequences when constructing
 hash key

	* ob.el (org-babel-sha1-hash): Fix check for zero length
	sequences
---
 lisp/ob.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/ob.el b/lisp/ob.el
index ec192da58..a655642de 100644
--- a/lisp/ob.el
+++ b/lisp/ob.el
@@ -620,7 +620,8 @@ the current subtree."
 				(lambda (arg)
 				  (let ((v (cdr arg)))
 				    (when (and v (not (and (sequencep v)
-							   (> (length v) 0))))
+							   (not (consp v))
+							   (= (length v) 0))))
 				      (if (stringp v)
 					  (mapconcat #'identity
 						     (sort (split-string v)