Add anything to the query that we might need to.
Overrides ExposedFormPluginBase::query
public function query() {
if (!$this
->exposedFilterApplied()) {
// We return with no query; this will force the empty text.
$this->view->built = TRUE;
$this->view->executed = TRUE;
$this->view->result = array();
}
else {
parent::query();
}
}