Ticket #40664: comment.patch

.php

@@ -3069 +3069 @@
         }
 
         if ( '' == $comment_content ) {
+                do_action("require_valid_comment", $comment_post_ID);
                 return new WP_Error( 'require_valid_comment', __( '<strong>ERROR</strong>: please type a comment.' ), 200 );
         }