Configuring a Y instance to emitFacade by default causes an error to be thrown by event-focus

This fix seems like it would have the least amount of possible side-effects, but I don't know for sure if it solves it completely.
Feel free to reject if you guys know of a better way :)

Fixes [#2533132](http://yuilibrary.com/projects/yui3/ticket/2533132)

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