function genesis_get_custom_field( $field, $post_id = null ) {

  // Use get_the_ID() if no $post_id is specified.
  $post_id = empty( $post_id ) ? get_the_ID() : $post_id;

  if ( ! $post_id ) {
    return '';
  }

  $custom_field = get_post_meta( $post_id, $field, true );

  if ( ! $custom_field ) {
    return '';
  }

  return is_array( $custom_field ) ? $custom_field : wp_kses_decode_entities( $custom_field );

}