[Bug 796578] discoverer: Don't crash when running with -v if channel-mask==0 and >7 channels

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796578

--- Comment #4 from Vivia Nikolaidou <vivia at ahiru.eu> ---
My first approach was to print "unknown" in that case, but then it looked bad:

    Channels: 16 (front-left, front-left, unknown, unknown, unknown, unknown,
rear-center, front-left, unknown, unknown, unknown, front-left, front-left,
front-left, unknown, unknown)

Whatever values are there are just default guesses anyway, the channel-mask is
0 so that looked wrong to me. That's why I thought about this approach.

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