fixed totp prompt

lib/api/client.dart

@@ -39,7 +39,7 @@ class Client {
   void reload_ignore_certs(bool? val) {
     ignoreCertificates = val ?? false;
     HttpOverrides.global = new IgnoreCertHttpOverrides(ignoreCertificates);
-    if(global == null) return;
+    if(global == null || global!.currentContext == null) return;
     VikunjaGlobal
         .of(global!.currentContext!)
         .settingsManager
@@ -97,7 +97,7 @@ class Client {
       headers: _headers,
       body: _encoder.convert(body),
     )
-        .then(_handleResponse).catchError((Object? obj) {print(obj);});
+        .then(_handleResponse);
   }
 
   Future<Response?> put(String url, {dynamic body}) {

lib/api/user_implementation.dart

@@ -10,15 +10,20 @@ class UserAPIService extends APIService implements UserService {
 
   @override
   Future<UserTokenPair> login(String username, password, {bool rememberMe = false, String? totp}) async {
-    var response = await client.post('/login', body: {
+    var body = {
       'long_token': rememberMe,
       'password': password,
-      'totp_passcode': totp,
       'username': username,
-    });
+    };
+    if(totp != null) {
+      body['totp_passcode'] = totp;
+  }
+    var response = await client.post('/login', body: body);
     var token = response?.body["token"];
     if(token == null || response == null || response.error)
-      return Future.value(UserTokenPair(null, null, error: response != null ? response.statusCode : 0));
+      return Future.value(UserTokenPair(null, null,
+          error: response != null ? response.body["code"] : 0,
+          errorString: response != null ? response.body["message"] : "Login error"));
     client.configure(token: token);
     return UserAPIService(client)
         .getCurrentUser()

lib/models/user.dart

@@ -39,7 +39,8 @@ class UserTokenPair {
   final User? user;
   final String? token;
   final int error;
-  UserTokenPair(this.user, this.token, {this.error = 0});
+  final String errorString;
+  UserTokenPair(this.user, this.token, {this.error = 0, this.errorString = ""});
 }
 
 class BaseTokenPair {

lib/pages/user/login.dart

@@ -193,7 +193,7 @@ class _LoginPageState extends State<LoginPage> {
       await vGlobal.newUserService!.login(
           _username, _password, rememberMe: this._rememberMe);
 
-      if (newUser.error == 412) {
+      if (newUser.error == 1017) {
         TextEditingController totpController = TextEditingController();
         await showDialog(context: context, builder: (context) =>
         new AlertDialog(
@@ -213,12 +213,14 @@ class _LoginPageState extends State<LoginPage> {
         await vGlobal.newUserService!.login(
             _username, _password, rememberMe: this._rememberMe,
             totp: totpController.text);
-
-        if (newUser.error == 0)
-          vGlobal.changeUser(
-              newUser.user!, token: newUser.token, base: _server);
+      } else if(newUser.error > 0) {
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(newUser.errorString)));
       }
 
+      if (newUser.error == 0)
+        vGlobal.changeUser(
+            newUser.user!, token: newUser.token, base: _server);
+
     } catch (ex) {
     /*  log(stacktrace.toString());
       showDialog(