修复new页面筛选数据错误的bug，传递p_d参数导致

@@ -177,7 +177,10 @@ class NewsaleController extends AbstractAction
             $color = $this->get('color', null);
             $size = $this->get('size', null);
             $price = $this->get('price', null);
+            $p_d = $this->get('discount', null);
+	        if ($p_d !== null) {
 		        $p_d = '0.1,0.3';
+	        }
             $dayLimit = $this->get('dayLimit', null);
             $limit = $this->get('limit', 60);
             $page = $this->get('page', 1);