Invalid reference to system.css

I've just updated template Purity III (2.0.3) and this problem (https://www.joomlart.com/forums/d/43072-systemcss1-failed-to-load-resource) is still not resolved.

You can open file: root/templates/purity_iii/tpls/blocks/head.php

Look for:

<?php
// SYSTEM CSS
$this->addStyleSheet(JURI::base(true) . '/templates/system/css/system.css');
?>

change to:

<?php
if (version_compare(JVERSION, '4.0', 'lt')) {
// SYSTEM CSS
$this->addStyleSheet(JURI::base(true) . '/templates/system/css/system.css');
}
?>

It's added in template but not release yet, it will be ready in the next version.

Yes, I know! But every update of the template, I have to redo this modification. Please, fix this for the next update. Thanks!