PHP Fatal error: Uncaught ValueError: DOMDocument::loadHTML(): Argument #1 ($source) must not be empty in feed-reader/includes/Controllers/class-feed-controller.php:291

[Jan Boddez]

So, I'm trying to add a feed, or rather, search a URL for feeds, and nothing happens (except there's this server-side error).

So, apparently this site is being overly restrictive or something, but either way $body = wp_remote_retrieve_body( $response ) is empty, and there should be check on that!