Report a useful mixer id, rather than ""
This was D8614, which got a "ship it" 30 months ago (but not an approval in Phab). The typo it incidentally fixed was fixed by Yuri in 2018. - Move warning about unregistered card down, so that the warning contains the newly-generated ID; otherwise the warning message is nonsensical, because it *hasn't* created a new ID yet.
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