>From 29a3d1ece607c6ddfdb18c5096f04fd08556df50 Mon Sep 17 00:00:00 2001
From: Viktor Rosenfeld <address@hidden>
Date: Tue, 14 May 2013 18:58:11 +0200
Subject: [PATCH] ox.el: Honor properties in derived backends with default
 `nil'.

	* ox.el (org-export--get-global-options): Only process
	properties once even if their value is `nil'.

TINYCHANGE
---
 lisp/ox.el | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lisp/ox.el b/lisp/ox.el
index 3a4a130..64bc799 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -1726,11 +1726,15 @@ process."
 	 ;; Priority is given to back-end specific options.
 	 (append (and backend (org-export-backend-options backend))
 		 org-export-options-alist))
-	plist)
+	plist
+	seen)
     (mapc
      (lambda (cell)
        (let ((prop (car cell)))
-	 (unless (plist-member plist prop)
+	 (unless (or
+		  (plist-member plist prop)
+		  (member prop seen))
+	   (add-to-list 'seen prop)
 	   (let ((value (eval (nth 3 cell))))
 	     ;; Only set property if default value is non-nil.
 	     (when value
-- 
1.8.2.2