Inserting images ant other attachments into post

Hello,
For now i’m using such code in single.php to insert images into post:

<strong>
Other photos:
</strong>
<?php echo do_shortcode('[gallery option1="value1"]'); ?>

and such code to insert other type attachments:

<strong>
Other attachments:
</strong>
<ul>
<?php
	$args = array(
		'post_type' => 'attachment',
		'post_mime_type' => 'application/pdf,application/msword',
		'numberposts' => -1,
		'post_status' => null,
		'post_parent' => $post->ID,
		'orderby' => 'menu_order',
		'order' => 'desc'
		);
	$attachments = get_posts($args);
	if ($attachments) {
		foreach ($attachments as $attachment) {
		echo '<li><a href="'.wp_get_attachment_url($attachment->ID).'">';
		echo $attachment->post_title;
		echo '</a></li>';
		}
	}
?>
</ul>

The problem i have is that even when there is no any images or attachments there is always written such text in the post:
Other photos:
Other attachments:

How to make these texts to appear if only there is uploaded images or other attachment types?

Thanks in advance..!