fallback tuner: never show services "greyed out" when fallback tuner is enabled.

Greying out service makes no sense because the local tuner cannot
know what services are actually available on the remote tuner. This
also allows "remote" services to be used in some circumstances where
they weren't available before and it allows zapping over them.
skin.py: Avoid GSOD in case of an attrib error

And reduce some code. Thanks atvblack from ATV and the report from Dream1975
http://forums.openpli.org/topic/35785-search-screen-gives-green-screen-of-death/
EpgSelection: Show multi EPG for currently selected service

Slightly change by keeping the current played service as fallback

Signed-off-by: littlesat <littlesat99@yahoo.com>
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2