Invisible Area

## Codepen 
Link: https://codepen.io/anon/pen/aMZxXK
Version: Latest (3.5.1)

## Explanation
- What is the behavior you expect? i can't see the area point. If you enable datalabel you can see the value but not the area lines
- What is happening instead? Invisible lines
- What error message are you getting? No errors.

Thanks