[vdr] vdr create zerosize info.vdr

[Andreas Brachold]

Hi,

I'm notice, that's vdr(1.3.28) create a empty info.vdr for recordings 
on some cases. (A file with 0 bytes size)

I think follow cause are responsible, the eye-catching timer was create
on channel without epg data (Event are undefined) and this timer was
defined without summary.

the attached file, should fix this

Cu,
Andreas
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