Default header image fix suggestion

Hi.
Thanks for the great theme. It’s simple yet festive.
I noticed a bug.
If you choose a custom header image, save and publish and then go back and choose the default header image and publish again, none is displayed.

I fixed it by adding the following code into the functions.php file

		register_default_headers(
		array(
			'default' => array(
				'url'           => get_stylesheet_directory_uri() . '/images/pepparkaka.png',
				'thumbnail_url' => get_stylesheet_directory_uri() . '/images/pepparkaka.png',
			)));

Bests,
Lena