title: Tabular Model: DISTINCTCOUNT on field with blanks in DAX
body: <p>I understanding that DISTINCTCOUNT function in DAX is supposed to ignore blanks. From this I'd expect that if you had 2 unique values and a blank in a column the DISTINCTCOUNT on that column would return 2.</p>
  
  <p>I am find this continues to return 3 i.e. the BLANK is treated as a value. How can I change this?</p>
  
  <p>I cannot find anywhere in the tabular model where I can change the equivalent of NullProcessing. I have tried creating a column with just BLANK() and this returns a count of 1 too where I'd expect 0.</p>
  
  <p>All help appreciated.</p>