🐛 [firebase_ui_auth] Login via google after deleting email account triggers error

## Bug report

When you delete an email account from the profile page and land back on the sign-in page, choosing sign-in with Google results in nothing happening. But when you reload the app you're signed in.

Error message:
```
E/flutter (21971): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Null check operator used on a null value
E/flutter (21971): #0 EmailVerificationController.user (package:firebase_ui_auth/src/email_verification.dart:68:36)
E/flutter (21971): firebase/flutterfire#1 EmailVerificationController.reload (package:firebase_ui_auth/src/email_verification.dart:82:11)
E/flutter (21971): firebase/flutterfire#2 EmailVerificationController.didChangeAppLifecycleState (package:firebase_ui_auth/src/email_verification.dart:63:7)
E/flutter (21971): firebase/flutterfire#3 WidgetsBinding.handleAppLifecycleStateChanged (package:flutter/src/widgets/binding.dart:673:16)
E/flutter (21971): firebase/flutterfire#4 ServicesBinding._handleLifecycleMessage (package:flutter/src/services/binding.dart:262:5)
E/flutter (21971): firebase/flutterfire#5 BasicMessageChannel.setMessageHandler. (package:flutter/src/services/platform_channel.dart:214:49)
E/flutter (21971): firebase/flutterfire#6 _DefaultBinaryMessenger.setMessageHandler. (package:flutter/src/services/binding.dart:393:35)
E/flutter (21971): firebase/flutterfire#7 _invoke2 (dart:ui/hooks.dart:183:13)
E/flutter (21971): firebase/flutterfire#8 _ChannelCallbackRecord.invoke (dart:ui/channel_buffers.dart:40:5)
E/flutter (21971): firebase/flutterfire#9 _Channel.push (dart:ui/channel_buffers.dart:130:31)
E/flutter (21971): firebase/flutterfire#10 ChannelBuffers.push (dart:ui/channel_buffers.dart:326:17)
E/flutter (21971): firebase/flutterfire#11 PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:664:22)
E/flutter (21971): firebase/flutterfire#12 _dispatchPlatformMessage (dart:ui/hooks.dart:86:31)
E/flutter (21971):
```

### Steps to reproduce

Steps to reproduce the behavior:

1. Have your sign-in event trigger redirect to profile page with
```
AuthStateChangeAction((context, state) {
Navigator.pushReplacementNamed(context, '$profileRoute');
}),
```
2. Have your sign-out action ont the profile screen route back to the sign-in page and delete the stack (to prevent user from going back to previous screens) like:
```
ProfileScreen(
// ... appBar etc.
actions: [
SignedOutAction((context) {
Navigator.pushAndRemoveUntil(context,
MaterialPageRoute(builder: (BuildContext context) {
return const SignInScreen();
}), (r) {
return false;
});
})
],
)
```
3. register with email
4. delete account on profile page (should bring you back to sign-in screen)
5. click on sign-in with Google and sign-in with Google account
6. be stuck on sign-in screen (with logs showing the mentioned stacktrace)

### Expected behavior

Step 5 in reproduce should redirect to profile page

---

### Flutter doctor

Run `flutter doctor` and paste the output below:

Click To Expand

```
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.7.10, on macOS 13.3 22E252 darwin-arm64, locale en-DE)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 14.3)
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] IntelliJ IDEA Ultimate Edition (version 2022.3.1)
[✓] IntelliJ IDEA Ultimate Edition (version 2022.2.3)
[✓] IntelliJ IDEA Ultimate Edition (version 2022.3.1)
[✓] VS Code (version 1.74.0)
[✓] Connected device (3 available)
[✓] HTTP Host Availability
```

---

### Flutter dependencies

Run `flutter pub deps -- --style=compact` and paste the output below:

Click To Expand

```
Dart SDK 2.19.6
Flutter SDK 3.7.10
butterfly 1.0.0+1

dependencies:
- firebase_auth 4.4.0 [firebase_auth_platform_interface firebase_auth_web firebase_core firebase_core_platform_interface flutter meta]
- firebase_core 2.9.0 [firebase_core_platform_interface firebase_core_web flutter meta]
- firebase_database 10.1.0 [firebase_core firebase_core_platform_interface firebase_database_platform_interface firebase_database_web flutter]
- firebase_dynamic_links 5.1.0 [firebase_core firebase_core_platform_interface firebase_dynamic_links_platform_interface flutter meta plugin_platform_interface]
- firebase_ui_auth 1.2.0 [email_validator firebase_auth firebase_core firebase_dynamic_links firebase_ui_localizations firebase_ui_oauth firebase_ui_shared flutter flutter_localizations flutter_svg]
- firebase_ui_oauth_google 1.0.21 [firebase_auth firebase_ui_oauth flutter google_sign_in]
- flutter 0.0.0 [characters collection js material_color_utilities meta vector_math sky_engine]
- google_fonts 4.0.3 [flutter http path_provider crypto]
- google_sign_in 5.4.4 [flutter google_sign_in_android google_sign_in_ios google_sign_in_platform_interface google_sign_in_web]
- intl 0.17.0 [clock path]
- wear 1.1.0 [flutter]

dev dependencies:
- flutter_lints 2.0.1 [lints]
- flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters collection js matcher material_color_utilities meta source_span stream_channel string_scanner term_glyph]

transitive dependencies:
- _flutterfire_internals 1.1.0 [collection firebase_core firebase_core_platform_interface flutter meta]
- async 2.10.0 [collection meta]
- boolean_selector 2.1.1 [source_span string_scanner]
- characters 1.2.1
- clock 1.1.1
- collection 1.17.0
- crypto 3.0.2 [typed_data]
- desktop_webview_auth 0.0.11 [crypto flutter http flutter_web_plugins plugin_platform_interface]
- email_validator 2.1.17
- fake_async 1.3.1 [clock collection]
- ffi 2.0.1
- file 6.1.4 [meta path]
- firebase_auth_platform_interface 6.13.0 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- firebase_auth_web 5.3.0 [firebase_auth_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins http_parser intl js meta]
- firebase_core_platform_interface 4.6.0 [collection flutter flutter_test meta plugin_platform_interface]
- firebase_core_web 2.3.0 [firebase_core_platform_interface flutter flutter_web_plugins js meta]
- firebase_database_platform_interface 0.2.3 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- firebase_database_web 0.2.2 [firebase_core firebase_core_web firebase_database_platform_interface flutter flutter_web_plugins js]
- firebase_dynamic_links_platform_interface 0.2.4 [_flutterfire_internals firebase_core flutter meta plugin_platform_interface]
- firebase_ui_localizations 1.3.0 [flutter flutter_localizations intl path]
- firebase_ui_oauth 1.2.0 [desktop_webview_auth firebase_auth firebase_ui_auth firebase_ui_shared flutter_svg flutter]
- firebase_ui_shared 1.1.0 [flutter]
- flutter_localizations 0.0.0 [flutter intl characters clock collection js material_color_utilities meta path vector_math]
- flutter_svg 1.1.6 [flutter meta path_drawing vector_math xml]
- flutter_web_plugins 0.0.0 [flutter js characters collection material_color_utilities meta vector_math]
- google_sign_in_android 6.1.8 [flutter google_sign_in_platform_interface]
- google_sign_in_ios 5.6.1 [flutter google_sign_in_platform_interface]
- google_sign_in_platform_interface 2.4.0 [flutter plugin_platform_interface quiver]
- google_sign_in_web 0.10.2+1 [flutter flutter_web_plugins google_sign_in_platform_interface js]
- http 0.13.5 [async http_parser meta path]
- http_parser 4.0.2 [collection source_span string_scanner typed_data]
- js 0.6.5 [meta]
- lints 2.0.1
- matcher 0.12.13 [meta stack_trace]
- material_color_utilities 0.2.0
- meta 1.8.0
- path 1.8.2
- path_drawing 1.0.1 [vector_math meta path_parsing flutter]
- path_parsing 1.0.1 [vector_math meta]
- path_provider 2.0.14 [flutter path_provider_android path_provider_foundation path_provider_linux path_provider_platform_interface path_provider_windows]
- path_provider_android 2.0.24 [flutter path_provider_platform_interface]
- path_provider_foundation 2.2.1 [flutter path_provider_platform_interface]
- path_provider_linux 2.1.10 [ffi flutter path path_provider_platform_interface xdg_directories]
- path_provider_platform_interface 2.0.6 [flutter platform plugin_platform_interface]
- path_provider_windows 2.1.5 [ffi flutter path path_provider_platform_interface win32]
- petitparser 5.1.0 [meta]
- platform 3.1.0
- plugin_platform_interface 2.1.4 [meta]
- process 4.2.4 [file path platform]
- quiver 3.2.1 [matcher]
- sky_engine 0.0.99
- source_span 1.9.1 [collection path term_glyph]
- stack_trace 1.11.0 [path]
- stream_channel 2.1.1 [async]
- string_scanner 1.2.0 [source_span]
- term_glyph 1.2.1
- test_api 0.4.16 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph matcher]
- typed_data 1.3.1 [collection]
- vector_math 2.1.4
- win32 3.1.3 [ffi]
- xdg_directories 1.0.0 [meta path process]
- xml 6.2.2 [collection meta petitparser]

```

---