修复未登录、未添加商品到购物车的情况下进入购物车页面，显示普通和预售商品tab的bug，同时添加随便逛逛和为您优选

Code Review By Rock Zhang

- Subproject commit 75bbc3b075de19f239532f60c5995d06c5f814e2
+ Subproject commit e9d066dd88a8e7e37103021c427a205a5cfcdcec

@@ -50,7 +50,7 @@ class CartModel
      */
     public static function getCartData($uid, $shoppingKey, $cartType = 'all', $onlyGift = false, $onlyAdvanceBuy = false)
     {
-        $result = array('cartNav' => true);
+        $result = array();
 
         // 用户是否登录
         if (empty($uid)) {
@@ -63,11 +63,14 @@ class CartModel
         // 处理普通购物车和预售购物车的数据
         do {
             if (!isset($cartData['data']) || empty($cartData['data'])) {
+                $result['isEmptyCart'] = true;
                 break;
             }
 
             $cart = $cartData['data'];
 
+            $result['cartNav'] = true;
+
             if ($cartType !== 'all') { // 加价购或者赠品数据
                 $result = self::procCartData($cart['ordinary_cart_data'], $onlyGift, $onlyAdvanceBuy);
                 break;

@@ -45,6 +45,7 @@ class IndexController extends AbstractAction
             'shoppingCartPage' => true,
             'shoppingCart' => CartModel::getCartData($uid, $shoppingKey)
         );
+
         // 渲染模板
         $this->_view->display('index', $data);
     }