console UI: don't bother preparing the channel
console UI: don't bother preparing the channel

Simon said:

> + # We only prepare the channel so that ::invalidated will be emitted
> + # when it closes.
>
> Is this really necessary? I would expect that channels would invalidate
> anyway.

And he's right: the channel proxy does invalidate without being prepared
if the connection goes away, or if someone else calls Close() on the
channel.

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