title: SSRS - can't remove blank rows
body: <p>I've got the following table in sql server 2012 reporting service, where I grouped elements after Time and calculated the average of the group items:</p>
  
  <p><img src="https://i.stack.imgur.com/sVQd4.jpg" alt="enter image description here"></p>
  
  <p>After using the Hide Duplicate property, I get the following table:</p>
  
  <p><img src="https://i.stack.imgur.com/POYjy.jpg" alt="enter image description here"></p>
  
  <p>Now I'm trying to remove the blank rows for hours now, but nothing works. I tried to use the visibility expresion with something like this:</p>
  
  <pre><code>=iif(Fields!Menge.Value = "",TRUE,FALSE)
  </code></pre>
  
  <p>but than I get an error, because of an wrong input. (The cell row is a number)</p>
  
  <p>How can I remove this blank rows??</p>
  
  <p>Update:</p>
  
  <p><img src="https://i.stack.imgur.com/TpdDI.jpg" alt="enter image description here"></p>