There isn’t an easy way to accomplish what you’re doing.
One easy solution would be to make the field field required. This would prevent the user from adding a row without selecting a file.
The other option would be to loop through the repeater and store the values in an array and then loop over the array to create your output.
<?php
$files = array();
if (have_rows('repeater_field')) {
while (have_rows('repeater_field')) {
the_row();
if (get_sub_field('repeater_files')) {
$atachment = get_sub_field('repeater_files');
$title = $atachment["title"];
$url = $atachment["url"];
$files[] = '<a href="'.$url.'">'.$title.'</a>';
} // end if get_sub_field
} // end while have_rows
} // end if have_rows
// see if there is anything in files
if (!empty($files)) {
?>
<div><h3>Title</h3></div>
<div class="box-atachment">
<?php
foreach ($files as $file) {
echo $file,'<br /><hr />';
}
?>
</div>
<?php
} // end if files !empty
?>
