message: Eventable: address PR #477#discussion_r97074509
diff: @@ -52,9 +52,9 @@ class Eventable {
  if (index !== -1) {
  eventList.splice(index, 1);
  }
  - let undef;
  - if (eventList && eventList.length === 0 || undef === listener) {
  - this[eventType] = undef;
  +
  + if (eventList && eventList.length === 0 || !listener) {
  + this[eventType] = listener;
  }
  }
  }
  