Empy views block field triggers notice

Problem

When you creat a block field for a view. This block is triggering notices when the view had no output:

Notice: Undefined index: #title in Drupal\ds\Plugin\DsField\DynamicBlockField->getTitle() (line 57 of /x/www/modules/contrib/ds/src/Plugin/DsField/DynamicBlockField.php).

This is because views is doing this:

      // When view_build is empty, the actual render array output for this View
      // is going to be empty. In that case, return just #cache, so that the
      // render system knows the reasons (cache contexts & tags) why this Views
      // block is empty, and can cache it accordingly.
      if (empty($output['view_build'])) {
        $output = ['#cache' => $output['#cache']];
      }