GravityView - Modify the content returned from the Custom Content field

gravityview-modify-custom-content.php

<?php 
/** Modify the content returned from the Custom Content field */
add_filter( 'gravityview/fields/custom/content_before', 'my_gv_custom_content_before', 10, 2 );

/** 
 * 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
 * @param  \GV\Template_Context $context
 * @return string
 */
function my_gv_custom_content_before( $content, $context = null ) {
	
	$id = 'MY_FIELD_ID';

	if( empty( $context->entry["{$id}"] ) ) {
		return '';
	}

	return $content;
}