Force WordPress CPT portfolio to Have Excerpts

functions.php

/**
 *
 * Force WordPress CPT portfolio to Have Excerpts
 * Check if $excerpt is empty and if so set post to draft
 */
if ( ! function_exists( 'envelopedlife_mandatory_excerpt' ) ) {
function envelopedlife_mandatory_excerpt($data) {
//change your_post_type to post, page, or your custom post type slug
  if ( 'portfolio' == $data['post_type'] ) {   
  $excerpt = $data['post_excerpt'];
  if (empty($excerpt)) { // If excerpt field is empty
      // Check if the data is not drafed and trashed
      if ( ( $data['post_status'] != 'draft' ) && ( $data['post_status'] != 'trash' ) ){
        $data['post_status'] = 'draft';
      	add_filter('redirect_post_location', 'envelopedlife_excerpt_error_message_redirect', '99');     
      }
    }
  }
  return $data;
}
add_filter('wp_insert_post_data', 'envelopedlife_mandatory_excerpt'); 
}	

/**
 *
 * Force WordPress CPT portfolio to Have Excerpts
 * Error direct
 */
if ( ! function_exists( 'envelopedlife_excerpt_error_message_redirect' ) ) {
function envelopedlife_excerpt_error_message_redirect($location) {
  $location = str_replace('&message=6', '', $location);
  return add_query_arg('excerpt_required', 1, $location); 
}
}

/**
 *
 * Force WordPress CPT portfolio to Have Excerpts
 * Admin notice message
 */
if ( ! function_exists( 'envelopedlife_excerpt_admin_notice' ) ) {
function envelopedlife_excerpt_admin_notice() {
  if (!isset($_GET['excerpt_required'])) return;
  switch (absint($_GET['excerpt_required'])) {
    case 1:
      $message = 'Envelope text editor field is empty! Envelope text editor is required to publish your envelope post.';
      break;
    default:
      $message = 'Unexpected error';
  }
  echo '<div id="notice" class="error"><p>' . $message . '</p></div>';
}
add_action('admin_notices', 'envelopedlife_excerpt_admin_notice');
}