Fix forward recipients error handling

lib/features/manage_account/data/network/forwarding_api.dart

@@ -43,7 +43,10 @@ class ForwardingAPI with HandleSetErrorMixin {
     return tMailForwardResult;
   }
 
-  Future<TMailForward> updateForward(AccountId accountId, TMailForward forward) async {
+  Future<(TMailForward, SetMethodException?)> updateForward(
+    AccountId accountId,
+    TMailForward forward,
+  ) async {
     log('ForwardingAPI::updateForward: ${forward.toJson()}');
     final setForwardMethod = SetForwardMethod(accountId)
       ..addUpdatesSingleton({
@@ -69,14 +72,9 @@ class ForwardingAPI with HandleSetErrorMixin {
     );
 
     final mapErrors = handleSetResponse([setForwardResponse]);
-    if (mapErrors.isNotEmpty) {
-      throw SetMethodException(mapErrors);
-    }
-
-    final updatedForward = setForwardResponse?.updated;
-    if (updatedForward?.isNotEmpty != true) {
-      throw UpdateForwardException();
-    }
+    final methodException = mapErrors.isNotEmpty
+      ? SetMethodException(mapErrors)
+      : null;
 
     final getForwardResponse = response.parse<GetForwardResponse>(
       getForwardInvocation.methodCallId,
@@ -84,10 +82,10 @@ class ForwardingAPI with HandleSetErrorMixin {
     );
 
     final newForward = getForwardResponse?.list.firstOrNull;
-    if (newForward == null) {
-      throw NotFoundForwardException();
+    if (newForward != null) {
+      return (newForward, methodException);
     }
 
-    return newForward;
+    throw methodException ?? NotFoundForwardException();
   }
 }