title: Google Spreadsheet conditional formatting based on empty cell with spaces
body: <p>I have conditional formatting for a column: the background color should be green if the <code>Cell is empty</code>, otherwise the background color should be white. This works well except for spaces. So if there is a space (or more) in a cell, then the background color will be green - incorrectly.</p>
  
  <p>Why? How can I avoid this? Thank you!</p>