title: Facebook APP: Empty invitable friends list
body: <p>I'm using Facebook Javascript API for an App I'm developing in a secure canvas. I'm testing from within facebook with an app Admin account (therefore all permissions are granted).</p>
  
  <p>In sync order I'm:</p>
  
  <p>initializing the API -> logging in -> /me -> /me/invitable_friends.</p>
  
  <p>The first 3 actions work as expected.
  The last one - /me/invitable_friends - returns an empty data array.</p>
  
  <p>Please let me know what you think.</p>