- Patch #1300298 by askibinski: empty tokens don't get replaced in welcome emails.

core/modules/user/user.module

@@ -2758,7 +2758,7 @@ Your account on [site:name] has been canceled.
   if ($replace) {
     // We do not sanitize the token replacement, since the output of this
     // replacement is intended for an e-mail message, not a web browser.
-    return token_replace($text, $variables, array('language' => $language, 'callback' => 'user_mail_tokens', 'sanitize' => FALSE));
+    return token_replace($text, $variables, array('language' => $language, 'callback' => 'user_mail_tokens', 'sanitize' => FALSE, 'clear' => TRUE));
   }
 
   return $text;