[2.1.5] [MFH] Fix text-decoration: none bug

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/branches/php4@1800 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef/CSS/TextDecoration.php

@@ -15,10 +15,13 @@ class HTMLPurifier_AttrDef_CSS_TextDecoration extends HTMLPurifier_AttrDef
         static $allowed_values = array(
             'line-through' => true,
             'overline' => true,
-            'underline' => true
+            'underline' => true,
         );
         
         $string = strtolower($this->parseCDATA($string));
+        
+        if ($string === 'none') return $string;
+        
         $parts = explode(' ', $string);
         $final = '';
         foreach ($parts as $part) {