* Fixed a bug that could be reproduced by following the test IT-SLO-3
defined in “Integrationstest ved tilslutning til NemLog-in” version
1.4. The concrete problem was that if the the oiosamlSession cookie
was missing or the oiosaml session was expired, then a null pointer
exception would occur in the oiosaml component when receiving a logout
request from other service providers in progress of doing a federation logout.