Ticket #32266: #32266.patch

src/wp-admin/includes/export.php

@@ -418 +418 @@
                          *
                          * @param string $post_excerpt Excerpt for the current post.
                          */
-                        echo wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) );
+            if( !empty( $post->post_excerpt ) ) {
+                echo wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) );
+            }
+            else {
+                echo wxr_cdata( apply_filters( 'the_excerpt_export', wp_trim_words( $post->post_content ), 55, '...' ) );
+            }
                 ?></excerpt:encoded>
                 <wp:post_id><?php echo $post->ID; ?></wp:post_id>
                 <wp:post_date><?php echo $post->post_date; ?></wp:post_date>