title: Select case not working as expected
body: <p>I have this very simple case in my select statement </p>
  
  <pre><code>   CASE WHEN PHONENR IS NOT NULL THEN '+46'+PHONENR ELSE ' ' END AS Phone 
  </code></pre>
  
  <p>my issue here i get to add the country code nr correctly infront of all existing numbers, but the empty rows are getting a default value of +46 instead of being just empty</p>