"attach all checked items to current post" fix [RC3]

Edit post mode->Upload/Insert->Media Library. There’s a bug when no items are checked and one clicks the “attach all checked items to current post”.

The fix has 2 parts:

file-gallery\includes\attachments.php ~li 340

/* [alx359] $current_attachments gets empty array for no attachments,
 which is not catched by !== and by consequence crashes the condition
if( false !== $current_attachments ) // if post already has attachments	*/
if( !empty($current_attachments) ) // if post already has attachments
{
	foreach( $possible_new_attachments as $pna ) // for each checked item...

~li 390 add new code:

// return output prepended by a list of checked attachments
	// using # (hash) as the separator

	//[alx359] added. if $attached_ids is not an array implode blows up
	if (empty($attached_ids)) $attached_ids = array(); 

	echo implode(',', $attached_ids) . '#' . $output;

	exit();
}
add_action('wp_ajax_file_gallery_copy_attachments_to_post', 'file_gallery_copy_attachments_to_post');