From 4abff2596654626d04a13fb3c59d1db9f8ed93cd Mon Sep 17 00:00:00 2001
From: Chad Horohoe <demon@users.mediawiki.org>
Date: Wed, 9 Feb 2011 14:59:44 +0000
Subject: [PATCH] Followup r81812: per CR, this could be 0

---
 includes/User.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/User.php b/includes/User.php
index 0f9d9738f3..46d6f42db3 100644
--- a/includes/User.php
+++ b/includes/User.php
@@ -586,7 +586,7 @@ class User {
 		}
 
 		// Preg yells if you try to give it an empty string
-		if( $wgInvalidUsernameCharacters ) {
+		if( $wgInvalidUsernameCharacters !== '' ) {
 			if( preg_match( '/[' . preg_quote( $wgInvalidUsernameCharacters, '/' ) . ']/', $name ) ) {
 				wfDebugLog( 'username', __METHOD__ .
 					": '$name' invalid due to wgInvalidUsernameCharacters" );
-- 
2.20.1