<div class="blank">
</div>

That’s not an empty page. To achieve this first we did a com_blankpage template override copying the file:

components/com_blankcomponent/views/default/tmpl/default.php

to:

templates/YOURTEMPLATE/html/com_blankcomponent/default/default.php

and comment/remove any output inside the template like:

<?php

// no direct access
defined('_JEXEC') or die;
?>

Now in your template index.php add this code:

            $document = JFactory::getDocument();
            $compOutput = $document->getBuffer('component');

            if (!empty($compOutput)) {
                $output = '<jdoc:include type="component" />';
            }

That will fully disable component output.