message after search with zero results

I am currently using the filter module for my product search. When one searches for a product which does not exist no message is shown. The page that displays is empty. I want to display a text like "sorry, no product corresponds to your search". Could you guide me where I can add that?

You can change the line:
if(!empty($html)){ ?>

to:

if(empty($html)){echo 'sorry, no product corresponds to your search';}else{ ?>

in the file "listing" of the view "product" of your front end template via the menu Display>Views.

that worked perfectly, thank you.