PHP Notice: Undefined offset: 0

by

If $wp_query->post_count == 0 I cant see how $wpdb->get_results( $wp_query->request ) would return any posts. So basically 

$request = $wpdb->get_results( $wp_query->request );

contains nothing and $request[0] doesn’t exist.
Ergo

PHP Notice: Undefined offset: 0

It would be interesting to know, what this could is supposed to achieve.