- Patch #20451 by Moshe: some ancient code was assuming that all apges in a...

- Patch #20451 by Moshe: some ancient code was assuming that all apges in a book are of type 'book'.

modules/book.module

@@ -55,7 +55,7 @@ function book_link($type, $node = 0, $main = 0) {
 
   $links = array();
 
-  if ($type == 'node' && $node->type == 'book') {
+  if ($type == 'node' && isset($node->parent)) {
     if (!$main) {
       if (book_access('create', $node)) {
         $links[] = l(t('add child page'), "node/add/book/parent/$node->nid");

modules/book/book.module

@@ -55,7 +55,7 @@ function book_link($type, $node = 0, $main = 0) {
 
   $links = array();
 
-  if ($type == 'node' && $node->type == 'book') {
+  if ($type == 'node' && isset($node->parent)) {
     if (!$main) {
       if (book_access('create', $node)) {
         $links[] = l(t('add child page'), "node/add/book/parent/$node->nid");