Conditional statement to show pagination

You could do this like so:

<?php
$next_post_link = get_next_post_link( '%link', 'Article Précédent', TRUE );
$previous_post_link = get_previous_post_link( '%link', 'Article Suivant', TRUE );
?>
<?php if ( $next_post_link || $previous_post_link ) : ?>
    <div class="article_single_prev_next">
        <div class="article_prev">
            <?php echo $next_post_link; ?>
        </div>
        <div class="article_next">
            <?php echo $previous_post_link; ?>
        </div>
    </div>
<?php endif; ?>