title: Identify & delete Blank sheets
body: <p>I am using <a href="https://phpexcel.codeplex.com" rel="nofollow">PhpExcel</a> to generate xls files.
  What I am doing right now is....</p>
  
  <ol>
  <li>Create sheets from A to Z</li>
  <li>Loop through all Members in site and get first character of firstname</li>
  <li>Using the first character I decide sheet index and activate that sheet.</li>
  <li>Then append that users name and add related analytic data in it.</li>
  </ol>
  
  <p>Now I want to remove all those sheets which do not have any data.</p>
  
  <p>How do I find which sheets are blank?</p>