当限购商品码不存在时，限购商品分享详情页跳转到404

Code Review By Rock Zhang

@@ -759,12 +759,11 @@ class DetailModel
         $result = array();
 
         do {
-            if (empty($productCode)) {
+            $productData = DetailData::limitProductData($uid, $productCode);
+
+            if (empty($productData) || empty($productData['data'])) {
                 break;
             }
-
-            $productData = DetailData::limitProductData($uid, $productCode);
-            
             $product = $productData['data'];
 
             $result['price'] = $product['price'];

@@ -304,6 +304,9 @@ class DetailController extends AbstractAction
 
         $uid = $this->getUid();
         $data = DetailModel::getLimitProductData($uid, $productCode);
+        if (empty($data)) {
+            $this->error();
+        }
 
         // APP下载链接地址
         $data['appSrc'] = 'http://a.app.qq.com/o/simple.jsp?pkgname=com.yoho';