Fix "empty" ACL entry when there's "User, " in user input field

plugins/acl/acl.php

@@ -441,7 +441,7 @@ class acl extends rcube_plugin
             if (!empty($this->specials) && in_array($user, $this->specials)) {
                 $username = $this->gettext($user);
             }
-            else {
+            else if (!empty($user)) {
                 if (!strpos($user, '@') && ($realm = $this->get_realm())) {
                     $user .= '@' . rcube_idn_to_ascii(preg_replace('/^@/', '', $realm));
                 }

plugins/acl/package.xml

@@ -13,9 +13,9 @@
 		<email>alec@alec.pl</email>
 		<active>yes</active>
 	</lead>
-	<date>2012-06-28</date>
+	<date>2013-01-29</date>
 	<version>
-		<release>1.0</release>
+		<release>1.1</release>
 		<api>0.7</api>
 	</version>
 	<stability>