services/raven: Fix ignoreError() edge case
services/raven: Fix ignoreError() edge case

Apparently this method sometimes receives "undefined"

skylines-project/skylines,skylines-project/skylines,Harry-R/skylines,skylines-project/skylines,shadowoneau/skylines,Turbo87/skylines,Turbo87/skylines,RBE-Avionik/skylines,Turbo87/skylines,Harry-R/skylines,RBE-Avionik/skylines,Harry-R/skylines,shadowoneau/skylines,skylines-project/skylines,Turbo87/skylines,shadowoneau/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,shadowoneau/skylines,Harry-R/skylines