WP Rest API – How to get an empty response if query has no posts

I found my answer in WP_REST_Posts_Controller class

/*
* If we intersected, but there are no post ids in common,
* WP_Query won't return "no posts" for post__in = array()
* so we have to fake it a bit.
*/
if ( ! $args['post__in'] ) {
    $args['post__in'] = array( 0 );
}

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