Fastscan: Fix GSOD in case last configuration config is invalid

This did happen die to the provider table did recently change and e.g.
the AustriaSat provider was named differently. Aswell in AutoFastScan as
in the normal FastScan this could lead to GSOD.

http://openpli.org/forums/topic/33236-dm8000-wakes-up-from-standby-every-10-minutes/