The problem is that the outing has not geometry. During the migration the geometries for routes are set from associated waypoints, and the geometries for outings are set from associated routes. But there are 171 waypoints that do not have a geometry. So, no geometry can be set for the associated routes and outings.
Currently when trying to open http://www.demov6.camptocamp.org/outings/694060 an error is shown.
The problem is that the outing has not geometry. During the migration the geometries for routes are set from associated waypoints, and the geometries for outings are set from associated routes. But there are 171 waypoints that do not have a geometry. So, no geometry can be set for the associated routes and outings.