support the NULL Channel in SetChannelDevice #6
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See:
https://www.vdr-portal.de/forum/index.php?thread/136284-patch-unbenutzte-frontends-schlie%C3%9Fen/&postID=1371712#post1371712
virtual bool SetChannelDevice(const cChannel *Channel, bool LiveView);
///< Sets the device to the given channel (actual physical setup).
///< If Channel is NULL, this means the device is no longer needed and may
///< turn itself into a power saving mode, if possible. The device must,
///< however, be ready for the next call with a non-NULL Channel at any
///< time.