1、优化ToastUtil

lib/utils/toast_util.dart

 import 'package:flutter/material.dart';
+import 'package:flutter_clx_base/common/extension.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 
 class ToastUtil {
-  static void showToast(String txt) {
-    if(txt.isEmpty){
+  static void showToast(String? txt) {
+    if(txt.isNullOrEmpty()){
       txt = "信息异常";
     }
     Fluttertoast.showToast(
-        msg: txt,
+        msg: txt ?? "",
         toastLength: Toast.LENGTH_SHORT,
         gravity: ToastGravity.BOTTOM,
         // timeInSecForIos: 1,