ENYO-2647: have enyo.Component.bubbleUp handle case where no event is passed in

Enyo-DCO-1.1-Signed-off-by: Cole Davis <cole.davis@lge.com>
Merge pull request #332 from enyojs/ENYO-2647

ENYO-2647: have enyo.Component.bubbleUp handle case where no event is pa...

Reviewed-By: Ben Combee (ben.combee@lge.com)