title: Looking to Disable Empty values in Color by legend for spotfire
body: <p>I am using specific column Test with values like 
  Apple
  Banana
  Orange
  Watermelon
  and some null values for coloring in visualization .The problem here is when i am trying to shown this color by as legends then null values are showing up in the list with (Empty) and color with gray.</p>
  
  <p>I want to show those Empty values in the visualization but not in the Legend.Thanks in Advance 
  <a href="https://i.stack.imgur.com/8DjtV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8DjtV.png" alt="please find the image attached"></a></p>