Read More - class setting not taken

When adding the default "Read More" field ($fields['node']['node_link']) to a region, you can set different settings.
This then generates a link with a text (like in the settings).
You set add a wrapper and class to it.

I wanted to add a class to my link self, but it doesnt take any of the class values entered unless there is a wrapper entered?

When looking in the function ds_render_field($field), it became clear why:

// Wrapper and class.
if (!empty($settings['wrapper'])) {
$wrapper = check_plain($settings['wrapper']);
$class = (!empty($settings['class'])) ? ' class="' . check_plain($settings['class']) . '"' : '';
$output = '<' . $wrapper . $class . '>' . $output . '';
}

Not sure if this is a bug or feature request, or just misconfiguration from my side.