Ticket #18713: 18713.2.diff

wp-includes/post.php

@@ -2439 +2439 @@
                 $previous_status = 'new';
         }
 
-        if ( ('' == $post_content) && ('' == $post_title) && ('' == $post_excerpt) && ('attachment' != $post_type) ) {
+        $empty_content = ! $post_content && ! $post_title && ! $post_excerpt && post_type_supports( $post_type, 'editor' )
+                && post_type_supports( $post_type, 'title' ) && post_type_supports( $post_type, 'excerpt' );
+        if ( apply_filters( 'wp_insert_post_empty_content', $empty_content, $postarr ) ) {
                 if ( $wp_error )
-                        return new WP_Error('empty_content', __('Content, title, and excerpt are empty.'));
+                        return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
                 else
                         return 0;
         }