Infinite redirection loop by NavigationMenu if no content sub-pages have been created.

The situation described in this ticket is a particular case of the case when the content subpage for the current page and current version cannot be found. This can be because:

• there are no content subpages at all
• there are content subpages but none is on the path of the current version
  • because the current version is on a new branch
  • because one of the ancestor versions of the current version has been deleted (BVERSION-18) and there is no other content subpages between the "hole" created by this deletion and the current version.

The expected behaviour is to not have a redirect loop (for sure) but instead a message that says that the content could not be found. Creating the content for the current version may or may not be an option on this screen.