GravityView: Removes Custom Content field content in case a certain entry's field is empty

gistfile1.php

<?php 
/** Modify the content returned from the Custom Content field */
add_filter( 'gravityview/fields/custom/content_before', 'my_gv_custom_content_before', 10, 1 );

/** 
 * Removes the custom content field's content in case a certain entry field is empty
 * Replace the MY_FIELD_ID by the field id (check it on the Gravity Forms form definition)
 * 
 * @param  string $content Custom Content field content
 * @return string 
 */
function my_gv_custom_content_before( $content ) {
	$id = 'MY_FIELD_ID';

	global $gravityview_view;
	extract( $gravityview_view->field_data );
	if( empty( $entry[ (string)$id ] ) ) {
		return '';
	}

	return $content;
}