Fix: connection problems checks

lib/mobile_example.dart

@@ -108,6 +108,7 @@ class _ExamplePageState extends State<ExamplePage> {
   Future<String> _getToken() async {
     var url =
         Uri.http('gymlink.freemyip.com:8080', 'api/auth/authorize_client');
+    try {
       var response = await http.post(url, body: {
         'GymKey': 'eeb42dcb-8e5b-4f21-825a-3fc7ada43445',
         'id': '123'
@@ -117,6 +118,9 @@ class _ExamplePageState extends State<ExamplePage> {
         return '';
       }
       return decodedBody['payload']['token'];
+    } catch (e) {
+      return '';
+    }
   }
 
   @override