Function to retrieve a picture if there is no picture is attached

Test the value before you use it:

<?php
if ( ! $img = get_field('img_actor', get_the_ID() ) )
    $img = 'http://www.example.com/wp-content/uploads/default.jpg';
?>
<img class="film" 
     src="https://wordpress.stackexchange.com/scripts/timthumb.php?src=<?php echo urlencode($img); ?>&h=251&w=175&zc=1"
     alt="<?php the_title_attribute(); ?>"  
     title="<?php the_title_attribute(); ?>"/>

I recommend not to use the same text for title and alt, this is very annoying for screen reader users.

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