[local_auth] Allow empty localizedReason for Android

packages/local_auth/local_auth_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.47
+
+* Allowing empty localizedReason for Android
+
 ## 1.0.46
 
 * Updates Java compatibility version to 11.

packages/local_auth/local_auth_android/android/src/main/java/io/flutter/plugins/localauth/AuthenticationHelper.java

@@ -70,7 +70,10 @@ interface AuthCompletionHandler {
 
     BiometricPrompt.PromptInfo.Builder promptBuilder =
         new BiometricPrompt.PromptInfo.Builder()
-            .setDescription(strings.getReason())
+            .setDescription(
+                strings.getReason().isEmpty()
+                    ? null
+                    : strings.getReason())
             .setTitle(strings.getSignInTitle())
             .setSubtitle(strings.getBiometricHint())
             .setConfirmationRequired(options.getSensitiveTransaction());

packages/local_auth/local_auth_android/lib/local_auth_android.dart

@@ -34,7 +34,7 @@ class LocalAuthAndroid extends LocalAuthPlatform {
     required Iterable<AuthMessages> authMessages,
     AuthenticationOptions options = const AuthenticationOptions(),
   }) async {
-    assert(localizedReason.isNotEmpty);
+    /// no empty check assertion because [localizedReason] can be empty for android
     final AuthResult result = await _api.authenticate(
         AuthOptions(
             biometricOnly: options.biometricOnly,

packages/local_auth/local_auth_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: local_auth_android
 description: Android implementation of the local_auth plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/local_auth/local_auth_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+local_auth%22
-version: 1.0.46
+version: 1.0.47
 
 environment:
   sdk: ^3.5.0

packages/local_auth/local_auth_android/test/local_auth_test.dart

@@ -91,6 +91,16 @@ void main() {
 
   group('authenticate', () {
     group('strings', () {
+      test('With empty reason', () async {
+        when(api.authenticate(any, any))
+            .thenAnswer((_) async => AuthResult.success);
+
+        const String reason = '';
+        final bool result = await plugin.authenticate(
+            localizedReason: reason, authMessages: <AuthMessages>[]);
+
+        expect(result, true);
+      });
       test('passes default values when nothing is provided', () async {
         when(api.authenticate(any, any))
             .thenAnswer((_) async => AuthResult.success);