Bug in tag clouds?

This seems to be still relevant, so here is the solution:

in wp-includes/category-template.php the function wp_tag_cloud echos the return value, which makes sense if it’s a HTML string but not if it’s an array.

So if you replace

if ( is_wp_error( $return ) )
		return false;
	else
		echo apply_filters( 'wp_tag_cloud', $return, $args );

with

if ( is_wp_error( $return ) )
		return false;
	else if (is_array($return)) {
	 return $return;
	} else {
		echo apply_filters( 'wp_tag_cloud', $return, $args );
	}
}

(line 234ff) to check if the return value is an array then the array-option works.