Do you mean that if the user does not use the filters or search, then you want no results? You would need to edit your template file to add some logic in. Like this:

global $searchandfilter;
$sf_current_query = $searchandfilter->get(1024)->current_query();
if ((!$sf_current_query->is_filtered())&&($sf_current_query->get_search_term()=="")) {
  echo '<div>Nothing to see here folks!</div>'; 
} else {
  // your template archive code/loop here
}

Change 1024 to the ID number of your form (from the form shortcode).

With that display method, your theme template controls what is displayed when no results are found.

Are you able to upload that template file to a file sharing site so that I can see it?

On line 106 I see and if starting, and also on the same line I see a while starting. The while ends on line 172, but where does the if end?

Ah, I see, yes.

So, what happens if you replace that line with this:

<?php endwhile; ?>
<div><p>No results found</p></div>
<?php>wp_reset_postdata(); endif; ?>

Do you see the message when results are not found? If not, then your theme is doing something odd.