What file empty cart system message

What file has the code for generating the cart empty system message?

I think I should be looking for this, JFactory::getApplication()->enqueueMessage( JText::_('CART_EMPTY'));

Thanks,
Shannon

We never chain function calls as that is only allowed on PHP5 and that we still support PHP4.
You should search for JText::_('CART_EMPTY')
It's in several places:
components/com_hikashop/controllers/checkout.php
components/com_hikashop/views/checkout/view.html.php