Cw-410 Null Issue With 2FA (#960)

* chore: Setup

* hotfix: null check operator used when totp arguments are null causing issues

* hotfix: null check operator used when totp arguments are null causing issues

* hotfix: null check operator used when totp arguments are null causing issues

* hotfix: null check operator used when totp arguments are null causing issues

* fix: Review changes

---------

Co-authored-by: David Adegoke <blazebrain@Davids-MacBook-Pro.local>

lib/reactions/check_connection.dart

@@ -1,10 +1,9 @@
 import 'dart:async';
 
+import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/sync_status.dart';
 import 'package:cake_wallet/store/settings_store.dart';
-import 'package:connectivity/connectivity.dart';
-
 Timer? _checkConnectionTimer;
 
 void startCheckConnectionReaction(

lib/src/screens/setup_2fa/setup_2fa_enter_code_page.dart

@@ -43,26 +43,24 @@ class TotpAuthCodePageState extends State<TotpAuthCodePage> {
 
   @override
   void initState() {
-    _reaction ??= reaction((_) => widget.setup2FAViewModel.state, (ExecutionState state) {
-      if (state is ExecutedSuccessfullyState) {
+    if(widget.totpArguments.onTotpAuthenticationFinished != null) {
+      _reaction ??= reaction((_) => widget.setup2FAViewModel.state, (ExecutionState state) {
         WidgetsBinding.instance.addPostFrameCallback((_) {
-          widget.totpArguments.onTotpAuthenticationFinished!(true, this);
-        });
-      }
+          if (state is ExecutedSuccessfullyState) {
+            widget.totpArguments.onTotpAuthenticationFinished!(true, this);
+          }
 
-      if (state is FailureState) {
-        print(state.error);
-        WidgetsBinding.instance.addPostFrameCallback((_) {
-          widget.totpArguments.onTotpAuthenticationFinished!(false, this);
-        });
-      }
+          if (state is FailureState) {
+            print(state.error);
+            widget.totpArguments.onTotpAuthenticationFinished!(false, this);
+          }
 
-      if (state is AuthenticationBanned) {
-        WidgetsBinding.instance.addPostFrameCallback((_) {
-          widget.totpArguments.onTotpAuthenticationFinished!(false, this);
-        });
-      }
+          if (state is AuthenticationBanned) {
+            widget.totpArguments.onTotpAuthenticationFinished!(false, this);
+          } 
+          });
     });
+    }
 
     super.initState();
   }

lib/store/settings_store.dart

@@ -580,7 +580,6 @@ abstract class SettingsStoreBase with Store {
     if (Platform.isAndroid) {
       final androidInfo = await deviceInfoPlugin.androidInfo;
       deviceName = '${androidInfo.brand}%20${androidInfo.manufacturer}%20${androidInfo.model}';
-      print(deviceName);
     } else if (Platform.isIOS) {
       final iosInfo = await deviceInfoPlugin.iosInfo;
       deviceName = iosInfo.model;