Cum verific daca tema are "custom-header" sau nu?

Imi creez o tema WordPress. Acum, daca exista deja o imagine/logo upload-ata, vreau sa afisez doar TITLUL si DESCRIEREA blogului. Ceva de genul:

<div id="header">
     <?php if (function_exists( 'add_theme_support' ))  { ?>
		<a href="<?php echo get_option('home'); ?>/" title="<?php bloginfo('name'); ?> - <?php bloginfo('description'); ?>/" > <img src="<?php header_image(); ?>" height="<?php echo get_custom_header()->height; ?>" width="<?php echo get_custom_header()->width; ?>" alt="<?php bloginfo('name'); ?> - <?php bloginfo('description'); ?>/">
	 <?php }
	 else { ?>
		<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
			<p class="description"><?php bloginfo('description'); ?></p>
	<?php } ?>
    <ul id="nav">
   <?php wp_nav_menu( array( 'theme_location' => 'meniu1' ) ); ?>
    </ul>  

    </div>

Numai ca, a 2-a parte a conditiei de mai sus, nu functioneaza. Nu afiseaza descrierea si titlul blogului atunci cand nu exista un custom-header.

Functia am declarat-o-n functions.php astfel:

$defaults = array(
	'default-image'          => '',
	'random-default'         => false,
	'width'                  => 0,
	'height'                 => 0,
	'flex-height'            => false,
	'flex-width'             => false,
	'default-text-color'     => '',
	'header-text'            => true,
	'uploads'                => true,
	'wp-head-callback'       => '',
	'admin-head-callback'    => '',
	'admin-preview-callback' => '',
);
add_theme_support( 'custom-header', $defaults );

De ce nu functioneaza? Are cineva vreo idee?