Suppress "Blogroll" where links are effectively uncategorized

Any ideas how I can show category titles for wp_list_bookmarks() for one site in a multisite, but supress “Blogroll” from appearing as a title when links in another site are uncategorized (ie they use the default category Blogroll).

Currently using:

<?php if( is_page('links') ) {
wp_list_bookmarks('title_li=&category_before=&category_after=');
} ?>

…which works perfectly here – http://groups.btcv.org.uk/lancaster/links/

…but shows annoying title here – http://groups.btcv.org.uk/chichester/links/

Thanks
Andy