ServiceMP3: Handle sServiceref on getInfoString

eServiceMP3::getInfoString didn't return info for sServiceref.
Without sServiceref Picons for GStreamer services cannot rendered
cause sServiceref was empty.

Signed-off-by: Littlesat <littlesat99@yahoo.com>
display frequency for DVB-C back in Hz

Signed-off-by: Littlesat <littlesat99@yahoo.com>
InfobarGenerics: fix possible GSOD when in movieplayer

Or any other non primer infobar
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2