ServiceStack/ServiceStack — pull request #417 by yeurch (2013-01-24 15:56:33+00:00)
Title: Auto-create SessionFactory in ServiceStackController

This is consistent with the behavior in Service, which instantiates
SessionFactory to new SessionFactory(Cache) if it's found to be null.

This prevents a null reference exception when accessing
ServiceStackController.Session without first registering an
ISessionFactory in the DI container.