lodash优化

@@ -41,7 +41,7 @@ class materialModel extends global.yoho.BaseModel {
                     goods: []
                 };
 
-                if (result && result.data && result.data.product_list) {
+                if (_.get(result, 'data.product_list', [])) {
                     let build = [];
 
                     build = productProcess.processProductList(result.data.product_list || [], {