Hide links to empty views

I'm trying to get the results of a view using PHP, but the result of views_get_view always seems to be empty, even though there are nodes in that view...

The code I'm using is as follows:

<?php
  $my_view = views_get_view('Activities_Accommodation');
  $my_view->set_display('page_1');
  $my_view->pre_execute($fields['title']->raw);
  $my_view->execute();
  dsm($my_view->result);
?>

When I go to the view in question with the argument in the URL, I see two nodes; however the output of dsm() is an empty array. What am I doing wrong?