/**
 * No initial results
 *
 * Don't show View results until a filter has been applied
 * 
 * Tests for custom field filters, taxonomy filters, or text searches
 */
function tssupp_no_initial_results( $query_results, $view_settings, $view_id ){
   
    $target_views = array( 123 ); // Edit to add IDs of Views to add this to
 
    if ( in_array( $view_id, $target_views ) ) {
   
        // if there is a search term set
        if ( !isset( $query_results->query['meta_query'] ) && !isset( $query_results->query['tax_query'] ) && !isset( $query_results->query['s'] ) ) {
            $query_results->posts = array();
            $query_results->post_count = 0;
            $query_results->found_posts = 0;
        }
    }
   
    return $query_results;
}
add_filter( 'wpv_filter_query_post_process', 'tssupp_no_initial_results', 10, 3 );