Drop outside dropzone does not fire any event

[FlacosFlace]

• I'm submitting a ...
  [x] bug report
  [] feature request
  [ ] question about the decisions made in the repository

• What is the current behavior?
  When I move item from one container to another and move dragged item over dragzone
  but drop item outside the dropzone dropped item appears in container i move over befere but dnd does not emit any event.
  
  
  

• What is the expected behavior?
  DND should emit some event to know that item was moved or move item to original place from witch was dragged.

• What is the motivation / use case for changing the behavior?
  Its confusing. List value does not match with DOM elements. Droped item value is still in the right container but DOM element is in the left.

• Please tell us about your environment:

• Angular version: 6.0.0
• ng2-dnd version: "^5.0.2"