From ba71964b161c394637d19ee279e17873a4adbc54 Mon Sep 17 00:00:00 2001
From: zhoumingji <zhoumingji@cmsr.chinamobile.com>
Date: Sat, 4 Mar 2023 14:28:16 +0800
Subject: [PATCH] Fix bug in dartgen: The property 'isEmpty' can't be
 unconditionally accessed because the receiver can be 'null'

---
 tools/goctl/api/dartgen/genvars.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/goctl/api/dartgen/genvars.go b/tools/goctl/api/dartgen/genvars.go
index 51a9fa13..72ee6bdc 100644
--- a/tools/goctl/api/dartgen/genvars.go
+++ b/tools/goctl/api/dartgen/genvars.go
@@ -31,7 +31,7 @@ Future<Tokens> getTokens() async {
   try {
     var sp = await SharedPreferences.getInstance();
     var str = sp.getString('tokens');
-    if (str.isEmpty) {
+    if (str == null || str.isEmpty) {
       return null;
     }
     return Tokens.fromJson(jsonDecode(str));
@@ -65,7 +65,7 @@ Future<Tokens?> getTokens() async {
   try {
     var sp = await SharedPreferences.getInstance();
     var str = sp.getString('tokens');
-    if (str.isEmpty) {
+    if (str == null || str.isEmpty) {
       return null;
     }
     return Tokens.fromJson(jsonDecode(str));