Fix handling of valueless attributes

diff --git a/includes/Sanitizer.php b/includes/Sanitizer.php
index 9078af9..e6c56e9 100644 (file)
--- a/includes/Sanitizer.php
+++ b/includes/Sanitizer.php
@@ -244,7 +244,7 @@ class Sanitizer {
                        if( !isset( $whitelist[$attribute] ) ) {
                                continue;
                        }
-                       if( $set[2] == '' ) {
+                       if( !isset( $set[2] ) ) {
                                # In XHTML, attributes must have a value.
                                $value = $set[1];
                        } elseif( $set[3] != '' ) {