message: Skip the permissions tables in ObjectStore::is_empty()
diff: @@ -877,8 +877,8 @@ void ObjectStore::delete_data_for_object(Group& group, StringData object_type) {
  bool ObjectStore::is_empty(Group const& group) {
  for (size_t i = 0; i < group.size(); i++) {
  ConstTableRef table = group.get_table(i);
  - std::string object_type = object_type_for_table_name(table->get_name());
  - if (!object_type.length()) {
  + auto object_type = object_type_for_table_name(table->get_name());
  + if (object_type.size() == 0 || object_type.begins_with("__")) {
  continue;
  }
  if (!table->is_empty()) {
  