Index: book.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/book.module,v
retrieving revision 1.293
diff -u -F^f -r1.293 book.module
--- book.module	24 Apr 2005 20:57:38 -0000	1.293
+++ book.module	29 Apr 2005 00:36:55 -0000
@@ -720,6 +720,9 @@ function book_admin_view($nid, $depth = 
 
     return form($output);
   }
+  else {
+    return "No book selected.";
+  }
 }
 
 function book_admin_save($nid, $edit = array()) {