RegionManager.RequestNavigate with all parameters does nothing when region does not exists.  Fixed.
RegionManager.RequestNavigate with all parameters does nothing when region does not exists.  Fixed.

allanrsmith/Prism,ali-hk/Prism,ethedy/Prism,hardcodet/Prism,frogger3d/Prism,dersia/Prism,ederbond/Prism