meteor/meteor — pull request #777 by cmather (2013-03-04 19:59:15+00:00)
Title: Make eventData an empty object if no data context is found.

This prevents the thisArg from getting set to `window` if eventData is
undefined.

See:
http://stackoverflow.com/questions/15137206/the-context-of-this-in-meteor-template-event-handlers-using-handlebars-for-te/15149650#15149650