[auth] Fix handling of no username during bitwarden import (#2010)

## Description

## Tests

auth/lib/ui/settings/data/import/bitwarden_import.dart

@@ -109,8 +109,8 @@ Future<int?> _processBitwardenExportFile(
           Code.steamDigits,
         );
       } else {
-        var issuer = item['name'];
-        var account = item['login']['username'];
+        var issuer = item['name'] ?? '';
+        var account = item['login']['username'] ?? '';
         code = Code.fromAccountAndSecret(
           Type.totp,
           account,

auth/lib/ui/settings/data/import/raivo_plain_text_import.dart

@@ -105,7 +105,7 @@ Future<int?> _processRaivoExportFile(BuildContext context, String path) async {
       otpUrl =
           'otpauth://$kind/$issuer:$account?secret=$secret&issuer=$issuer&algorithm=$algorithm&digits=$digits&counter=$counter';
     } else {
-      throw Exception('Invalid OTP type');
+      throw Exception('Invalid OTP type $kind');
     }
     parsedCodes.add(Code.fromOTPAuthUrl(otpUrl));
   }

auth/pubspec.yaml

@@ -1,6 +1,6 @@
 name: ente_auth
 description: ente two-factor authenticator
-version: 3.0.7+307
+version: 3.0.8+308
 publish_to: none
 
 environment: