Ticket #30775: 30775.diff

src/wp-includes/post-functions.php

@@ -2921 +2921 @@
          * @param bool  $maybe_empty Whether the post should be considered "empty".
          * @param array $postarr     Array of post data.
          */
-        if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
+        if ( ! $update && apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
                 if ( $wp_error ) {
                         return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
                 } else {