Asi a voz de pronto, puedes probar esto:
Código PHP:
<div class="tabpost">
<?php if($featucatn = '') : ?>
<?php $my_query = new WP_Query('showposts=5'); ?>
<?php while ($my_query->have_posts()) : $my_query->the_post(); ?>
<h4><?php the_title();?></h4>
<?php endwhile;?>
<?php else : ?>
<?php
$featucatn = get_option('grft_gldcatn');
$my_query = new WP_Query('showposts=5&category_name='. $featucatn .'');
if ($my_query->have_posts()) :
?>
<?php while ($my_query->have_posts()) : $my_query->the_post();$do_not_duplicate = $post->ID; ?>
<h4><?php the_title();?></h4>
<?php endwhile; ?>
<?php endif; ?>
<?php endif; ?>
</div>