title: IsBlank function not delegable?
body: <p><a href="https://i.stack.imgur.com/w0rGt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/w0rGt.png" alt="enter image description here"></a></p>
  
  <p>I'm trying to filter out rows on a particular column being blank. It doesn't seem to be delegable. I'm using sharepoint list as a datasource.</p>