v4l2object: Don't set empty interlace-mode list
If for some reason we fail to probe formats (all try_fmt calls fail, for example), this is not a critical error, but we end up with an empty list of interlace modes. This causes all subsequent negotiation to fail. This patch fixes interlace-mode setting to be skipped if we failed to detect any. https://bugzilla.gnome.org/show_bug.cgi?id=775702
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