[Web] Fix mailbox editing when password is unchanged, fix adding new administrator (fixes #4054, fixes #4053); [Web] Update libs, add LDAP for future admin/domain admin authentication

data/web/inc/functions.domain_admin.inc.php

@@ -201,7 +201,7 @@ function domain_admin($_action, $_data = null) {
               ));
             }
           }
-          if (!empty($password) && !empty($password2)) {
+          if (!empty($password)) {
             if (password_check($password, $password2) !== true) {
               return false;
             }