Don't Show Payment Term Fee Labels if Zero

functions.php

<?php // don't include this line in your functions.php, since it already starts with it.

function si_change_doc_fees_labels( $fees, $doc ) {
	foreach ( $fees as $key => $fee ) {
		$fees[ $key ]['always_show'] = 0;
	}
	return $fees;
}
add_filter( 'si_doc_fees', 'si_change_doc_fees_labels', 100, 2 );