🐛 [firebase_ui_auth] PhoneInputScreen crashes when locale has no countryCode

[agonhajdari]

Bug report

Describe the bug

PhoneInputView crashes when countryCode is null

Steps to reproduce

Steps to reproduce the behavior:

1. git clone https://github.com/agonhajdari/flutterfire-countrycodecrash.git
2. flutter run --flavor development --target lib/main_development.dart # only for android configured
3. See 'Null check operator used on a null value'

Expected behavior

PhoneInputView without errors.

Sample project

https://github.com/agonhajdari/flutterfire-countrycodecrash

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Additional context

If countryCode is null then use WidgetsBinding.instance.platformDispatcher.locale.countryCode or if that is also null then use first country in countries.

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Flutter doctor

Run flutter doctor and paste the output below:

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Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.3.5, on macOS 13.0 22A380 darwin-x64, locale en-DE)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 14.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✓] VS Code (version 1.72.2)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

• No issues found!

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Flutter dependencies

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

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Dart SDK 2.18.2
Flutter SDK 3.3.5
countrycodecrash 1.0.0+1

dependencies:
- bloc 8.1.0 [meta]
- firebase_auth 4.1.0 [firebase_auth_platform_interface firebase_auth_web firebase_core firebase_core_platform_interface flutter meta]
- firebase_core 2.1.1 [firebase_core_platform_interface firebase_core_web flutter meta]
- firebase_ui_auth 1.0.3 [desktop_webview_auth email_validator firebase_auth firebase_core firebase_dynamic_links firebase_ui_localizations firebase_ui_oauth flutter flutter_localizations flutter_svg]
- firebase_ui_localizations 1.0.1 [flutter flutter_localizations intl path]
- flutter 0.0.0 [characters collection material_color_utilities meta vector_math sky_engine]
- flutter_bloc 8.1.1 [flutter bloc provider]
- flutter_localizations 0.0.0 [flutter intl characters clock collection material_color_utilities meta path vector_math]
- intl 0.17.0 [clock path]

dev dependencies:
- bloc_test 9.1.0 [bloc diff_match_patch meta mocktail test]
- flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters collection matcher material_color_utilities meta source_span stream_channel string_scanner term_glyph]
- mocktail 0.3.0 [collection matcher test]
- very_good_analysis 3.1.0

transitive dependencies:
- _fe_analyzer_shared 41.0.0 [meta]
- _flutterfire_internals 1.0.6 [cloud_firestore_platform_interface cloud_firestore_web collection firebase_core firebase_core_platform_interface flutter meta]
- analyzer 4.2.0 [_fe_analyzer_shared collection convert crypto glob meta package_config path pub_semver source_span watcher yaml]
- args 2.3.1
- async 2.9.0 [collection meta]
- boolean_selector 2.1.0 [source_span string_scanner]
- characters 1.2.1
- clock 1.1.1
- cloud_firestore_platform_interface 5.8.3 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- cloud_firestore_web 3.0.3 [_flutterfire_internals cloud_firestore_platform_interface collection firebase_core firebase_core_web flutter flutter_web_plugins js]
- collection 1.16.0
- convert 3.0.2 [typed_data]
- coverage 1.3.2 [args logging package_config path source_maps stack_trace vm_service]
- crypto 3.0.2 [typed_data]
- desktop_webview_auth 0.0.9 [crypto flutter http]
- diff_match_patch 0.4.1
- email_validator 2.1.17
- fake_async 1.3.1 [clock collection]
- file 6.1.2 [meta path]
- firebase_auth_platform_interface 6.11.0 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- firebase_auth_web 5.1.0 [firebase_auth_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins http_parser intl js meta]
- firebase_core_platform_interface 4.5.2 [collection flutter flutter_test meta plugin_platform_interface]
- firebase_core_web 2.0.1 [firebase_core_platform_interface flutter flutter_web_plugins js meta]
- firebase_dynamic_links 5.0.3 [firebase_core firebase_core_platform_interface firebase_dynamic_links_platform_interface flutter meta plugin_platform_interface]
- firebase_dynamic_links_platform_interface 0.2.3+19 [_flutterfire_internals firebase_core flutter meta plugin_platform_interface]
- firebase_ui_oauth 1.0.3 [desktop_webview_auth firebase_auth firebase_ui_auth flutter_svg flutter]
- 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]
- frontend_server_client 2.1.3 [async path]
- glob 2.1.0 [async collection file path string_scanner]
- http 0.13.5 [async http_parser meta path]
- http_multi_server 3.2.1 [async]
- http_parser 4.0.1 [collection source_span string_scanner typed_data]
- io 1.0.3 [meta path string_scanner]
- js 0.6.4
- logging 1.0.2
- matcher 0.12.12 [stack_trace]
- material_color_utilities 0.1.5
- meta 1.8.0
- mime 1.0.2
- nested 1.0.0 [flutter]
- node_preamble 2.0.1
- package_config 2.1.0 [path]
- path 1.8.2
- path_drawing 1.0.1 [vector_math meta path_parsing flutter]
- path_parsing 1.0.1 [vector_math meta]
- petitparser 5.1.0 [meta]
- plugin_platform_interface 2.1.3 [meta]
- pool 1.5.1 [async stack_trace]
- provider 6.0.3 [collection flutter nested]
- pub_semver 2.1.1 [collection meta]
- shelf 1.3.1 [async collection http_parser path stack_trace stream_channel]
- shelf_packages_handler 3.0.1 [path shelf shelf_static]
- shelf_static 1.1.1 [convert http_parser mime path shelf]
- shelf_web_socket 1.0.2 [shelf stream_channel web_socket_channel]
- sky_engine 0.0.99
- source_map_stack_trace 2.1.0 [path stack_trace source_maps]
- source_maps 0.10.10 [source_span]
- source_span 1.9.0 [collection path term_glyph]
- stack_trace 1.10.0 [path]
- stream_channel 2.1.0 [async]
- string_scanner 1.1.1 [source_span]
- term_glyph 1.2.1
- test 1.21.4 [analyzer async boolean_selector collection coverage http_multi_server io js node_preamble package_config path pool shelf shelf_packages_handler shelf_static shelf_web_socket source_span stack_trace stream_channel typed_data web_socket_channel webkit_inspection_protocol yaml test_api test_core]
- test_api 0.4.12 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph matcher]
- test_core 0.4.16 [analyzer async args boolean_selector collection coverage frontend_server_client glob io meta package_config path pool source_map_stack_trace source_maps source_span stack_trace stream_channel vm_service yaml matcher test_api]
- typed_data 1.3.1 [collection]
- vector_math 2.1.2
- vm_service 8.3.0
- watcher 1.0.1 [async path]
- web_socket_channel 2.2.0 [async crypto stream_channel]
- webkit_inspection_protocol 1.1.0 [logging]
- xml 6.1.0 [collection meta petitparser]
- yaml 3.1.1 [collection source_span string_scanner]

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[danagbemava-nc]

I can reproduce the issue using the code sample provided above.