better exception handling

Author: KhaleelSH

templates/flutter/lib/src/client_io.dart.twig

@@ -1,7 +1,6 @@
 import 'dart:io';
 import 'package:cookie_jar/cookie_jar.dart';
 import 'package:device_info_plus/device_info_plus.dart';
-import 'package:flutter/services.dart';
 import 'package:http/http.dart' as http;
 import 'package:http/io_client.dart';
 import 'package:package_info_plus/package_info_plus.dart';