Add a sanity check for null events, classes and package names.
Add a sanity check for null events, classes and package names.

--HG--
extra : convert_revision : ce28910f0f79126e9ac24372c77249380593439e

beqabeqa473/Asra,bramd/spiel,bramd/spiel,bramd/spiel,beqabeqa473/Asra,beqabeqa473/Asra