Defines route lifecycle method
routerOnReuse, which is called by the router at the end of a
successful route navigation when CanReuse is implemented and returns or resolves to true.
routerOnReuse hook is called with two ComponentInstructions as
parameters, the first representing the current route being navigated to,
and the second parameter representing the previous route or
@override Future<Null> routerOnReuse(ComponentInstruction next, prev) => _setCrisis(next.params['id']);
See the router documentation for details.