Fix: connection problems checks

lib/mobile_example.dart

@@ -108,15 +108,19 @@ class _ExamplePageState extends State<ExamplePage> {
   Future<String> _getToken() async {
     var url =
         Uri.http('gymlink.freemyip.com:8080', 'api/auth/authorize_client');
-    var response = await http.post(url, body: {
-      'GymKey': 'eeb42dcb-8e5b-4f21-825a-3fc7ada43445',
-      'id': '123'
-    }); // Just testing token
-    var decodedBody = jsonDecode(response.body) as Map;
-    if (decodedBody['payload'] == null) {
+    try {
+      var response = await http.post(url, body: {
+        'GymKey': 'eeb42dcb-8e5b-4f21-825a-3fc7ada43445',
+        'id': '123'
+      }); // Just testing token
+      var decodedBody = jsonDecode(response.body) as Map;
+      if (decodedBody['payload'] == null) {
+        return '';
+      }
+      return decodedBody['payload']['token'];
+    } catch (e) {
       return '';
     }
-    return decodedBody['payload']['token'];
   }
 
   @override