title: Facebook app error when leaving "native ios app" field blank
body: <p>I previously had a facebook app working great with my native IOS app.  I recently recreated the app to rename it for when we release to the app store.</p>
  
  <p>When I select "Native IOS App" and enter the bundled Id but leave "iphone app store id" blank, I get this error:</p>
  
  <p>"Error
  You have enabled a Native iOS App integration for your app, but have not specified an iPhone App Store ID or iPad App Store ID"</p>
  
  <p>It says this field is optional.</p>