Accommodation field broken after purge

[ThiefMaster]

After the field has been purged, the value was this:

{'choice': '35828738-2aa4-48ee-8175-d6170f5a3de2', 'arrivalDate': None, 'departureDate': None, 'isNoAccommodation': True}

1. It should not have the camelCased keys since the code expects snake_cased keys. This causes an error when viewing the registration (in the management area)!
2. Maybe we should show it in the UI as blank and not using the actual caption of the no-accommocation option?