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1. If we have a channel_announcement, the channel is public, otherwise it's not. Not all channels are public, as they can be local: those have a NULL channel_announcement. 2. If we don't have a channel_update, we know nothing about that half of the channel, and no other fields are valid. 3. We can tell if a half channel is disabled by the flags field directly. Note that we never send halfchannels without an update over gossip_getchannels_reply so that marshalling/unmarshalling can be vastly simplified. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>