fallback to id as indicator for the requested page

Due to rare situations where WCF (or packages of 3rd parties) doesn’t
respect the used link manipulation for menu items linking to pages
created with the cms, some links didn’t point to the intended
destination.
E.g. the main breadcrumb (created by WCF) ignores a custom method for
manipulating a menu item link. Thereby, the breadcrumb pointed to an
unknown destination and redirect mechanisms took effect.