TF-611 Add view email rule filter creator

lib/features/mailbox_creator/presentation/extensions/validator_failure_extension.dart

@@ -34,4 +34,12 @@ extension ValicatorFailureExtension on VerifyNameFailure {
       return '';
     }
   }
+
+  String getMessageRulesFilter(BuildContext context) {
+    if (exception is EmptyNameException) {
+      return AppLocalizations.of(context).this_field_cannot_be_blank;
+    } else {
+      return '';
+    }
+  }
 }