If there are no subpages in a book (just a root page), the book admin page admin/content/book/%nid shows a table header with no content in table. According to http://drupal.org/node/604342 and #504428: Roll-out 'Empty text' pattern to other admin pages. empty table should contain an explanation and/or call to action.
Proposed wording if there is no content in the table:
No book content available.
Why not call to action link? Concistency: we currently do not do it for content admin page. Create a separate issue to contest / sync this.
|empty_book.png||41.21 KB||Ignored: Check issue status.||None||None|