Fix E_NOTICE error with User/Register model

Author: carlbennett

models/User/Register.php

@@ -6,10 +6,14 @@
 
 class Register extends Model {
 
+  public $email;
+  public $username;
   public $user_session;
 
   public function __construct() {
     parent::__construct();
+    $this->email        = null;
+    $this->username     = null;
     $this->user_session = null;
   }