Profile: davidL-10

// custom filter that shows no search results if either filter is empty
add_filter( 'wpv_filter_query_post_process', 'drop_empty_search_query_post_process', 10, 3 );
function drop_empty_search_query_post_process( $query, $view_settings, $view_id ) {
    $ids = array(12345);
    if (in_array($view_id, $ids)){
      if (
        // supplier type filter needs to check for not '0' as well as not empty
        ( isset($_GET['wpv-supplier-category']) && $_GET['wpv-supplier-category'] != '0' )
          &&
        // location filter needs to check for not '0' as well as not empty
        ( isset($_GET['wpv-area-served']) && $_GET['wpv-area-served'] != '0' )
      ) {
      } else {
        $query->posts = array();
        $query->found_posts = 0;
        $query->post_count = 0;
      }
    }
    return $query;
}