message: Enabled backward button in filebrowser empty folder view.
diff: @@ -870,11 +870,11 @@ void FileBrowserDialog::updateTable(const QList<SeafDirent>& dirents)
  {
  if (dirents.isEmpty()) {
  stack_->setCurrentIndex(INDEX_EMPTY_VIEW);
  - return;
  - }
  -
  + } else {
  table_model_->setDirents(dirents);
  stack_->setCurrentIndex(INDEX_TABLE_VIEW);
  + }
  +
  if (!forward_history_.empty()) {
  forward_button_->setEnabled(true);
  } else {
  