Fatal error

Ready to be reviewed

I'm going to test this.

Seems this is missing this from 2.x - I wonder if one of the recent phpcs ticket changes stripped it

ImportPluginBase

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    parent::submitConfigurationForm($form, $form_state);
  }

Automatically closed - issue fixed for 2 weeks with no activity.