openlayers/ol3 — pull request #467 by szymonc (2013-04-04 20:43:57+00:00)
Title: Uncaught AssertionError: Assertion failed: Event target is not initialized. Did you call superclass (goog.events.EventTarget) constructor? 

Fix the error:
Uncaught AssertionError: Assertion failed: Event target is not initialized. Did you call superclass (goog.events.EventTarget) constructor?

Occurs when debugging not compiled code.

MapBrowserEventHandler should have the eventTargetListeners_ implemented because it is neseccary to pass the assert in goog.events.EventTarget.prototype.assertInitialized