null showing up as data label when trying to create a chart with missing/null values

[OriginalEXE]

Codepen

https://codepen.io/anon/pen/PgqOPp

Explanation

• What is the behavior you expect?
  Data labels should not show null values

• What is happening instead?
  Data values show a literal "null" text for points with null value

[junedchhipa]

Yeah, shouldn’t be happening. Will take a look.