title: Analysis services Filter function implicitly filters empty elements
body: <p>I need to filter members from [__Account.Account selection] by some condition regardless if members are empty or not, but Filter() function implicitly excludes empty members. Is this is a bug or a feature? MSDN does not mention such behavior for Filter function. </p>
  
  <p>Any idea how to avoid the issue?</p>
  
  <pre><code>WITH 
    SET [__Account.Account selection] AS 
      '{
        {
          [Account].[Account Number].&amp;[110]
         ,[Account].[Account Number].&amp;[1130]
         ,[Account].[Account Number].&amp;[1164]
         ,[Account].[Account Number].&amp;[1210]
         ,[Account].[Account Number].&amp;[1300]
         ,[Account].[Account Number].&amp;[20]
         ,[Account].[Account Number].&amp;[8500]
         ,[Account].[Account Number].&amp;[8040]
        }
      }' 
    SET [__Account.Account Number_RootMembers_Smart] AS 
      '{
      Filter(
          [__Account.Account selection],
          1 = 1)}' 
  SELECT 
    [__Account.Account Number_RootMembers_Smart] ON ROWS
   ,{} ON COLUMNS
  FROM [Adventure Works]
  </code></pre>
  
  <p>NOTE: Function Generate() has the same behavior.</p>
  
  <p>NOTE2: By "empty member" I mean member with not value on any measure.</p>
  
  <p><a href="https://i.stack.imgur.com/Baaxb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Baaxb.png" alt="Response"></a></p>
  
  <p>And there are members with measures...
  <a href="https://i.stack.imgur.com/GFVKo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GFVKo.png" alt="enter image description here"></a></p>