Remove redundant serializer.
Remove redundant serializer.

kooditiimi/linkedevents,aapris/linkedevents,kooditiimi/linkedevents,tuomas777/linkedevents,tuomas777/linkedevents,City-of-Helsinki/linkedevents,kooditiimi/linkedevents,aapris/linkedevents,kooditiimi/linkedevents,City-of-Helsinki/linkedevents,aapris/linkedevents,tuomas777/linkedevents,City-of-Helsinki/linkedevents