title: map to form select Scala Play2 using reactivemongo
body: <p>I have in a Play2 Template:</p>
  
  <pre><code>files: Option[List[(String, reactivemongo.api.gridfs.ReadFile[reactivemongo.bson.BSONValue])]]
  </code></pre>
  
  <p>I would like to display the files in a drop down form Select, but only if the files are there!</p>
  
  <p>How would I do this?</p>