From b19e0b60ce8e75d61cfbc3c405464ea767a6eaac Mon Sep 17 00:00:00 2001
From: River Tarnell <kateturner@users.mediawiki.org>
Date: Thu, 9 Sep 2004 23:04:08 +0000
Subject: [PATCH] don't parse blank ISBNs

---
 includes/Parser.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/includes/Parser.php b/includes/Parser.php
index f15b4e38d6..be98d71c3a 100644
--- a/includes/Parser.php
+++ b/includes/Parser.php
@@ -2094,6 +2094,7 @@ class Parser
 		$valid = '0123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 
 		foreach ( $a as $x ) {
+			if ( $x == '' ) continue;
 			$isbn = $blank = '' ;
 			while ( ' ' == $x{0} ) {
 				$blank .= ' ';
-- 
2.20.1