fix action

@@ -69,7 +69,7 @@ export default {
       commit(Types.FETCH_YOHO_COUPON_FAILED);
     }
 
-    return result.data.couponList ? result.data.couponList.length !== 0 : false;
+    return result && result.data && result.data.couponList ? result.data.couponList.length !== 0 : false;
   },
 
   async fetchYohoNum({commit}) {