In index.php of the template on the line
<div class="error">
<h2>
<?php echo JText::_('JNOTICE'); ?>
</h2>
<jdoc:include type="message" />
</div>
delete
<h2>
<?php echo JText::_('JNOTICE'); ?>
</h2>
Your cart is empty
In index.php of the template on the line
<div class="error">
<h2>
<?php echo JText::_('JNOTICE'); ?>
</h2>
<jdoc:include type="message" />
</div>
delete
<h2>
<?php echo JText::_('JNOTICE'); ?>
</h2>
Please Note: If you have made any custom changes to the template code, make a backup of your existing template and save it to your computer before updating.