Accept onion failure without a channel_update
#2854
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lightning/bolts#1163 makes the channel update in onion failures optional. One reason for this change is that it can be a privacy issue: by applying a `channel_update` received from an payment attempt, you may reveal that you are the sender. Another reason is that some nodes have been omitting that field for years (which was arguably a bug), and it's better to be able to correctly handle such failures.
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lightning/bolts#1163 makes the channel update in onion failures optional. One reason for this change is that it can be a privacy issue: by applying a
channel_updatereceived from an payment attempt, you may reveal that you are the sender. Another reason is that some nodes have been omitting that field for years (which was arguably a bug), and it's better to be able to correctly handle such failures.