title: Why is my JSON URL not outputting JSON data?
body: <p>I have checked the URL and it works but when I try to output the <code>readableJSON</code>, it is empty?!</p>
  
  <p>Here is my output:</p>
  
  <pre><code>Not empty now
  2016-02-20 10:19:29.162 ThisLondon[55922:4080604] the URL: [
  
  ]
  2016-02-20 10:19:29.162 ThisLondon[55922:4080604] 0
  </code></pre>
  
  <p>Here is my code:</p>
  
  <pre><code>selectedTube = "Circle"
  let url = NSURL(string: "https://api.tfl.gov.uk/Line/\(selectedTube)/Arrivals?app_id=6573044a&amp;app_key=7a97df35339dc68625384077a5e07304")
  let jsonData = NSData(contentsOfURL: url!)
  let readableJSON = JSON(data: jsonData!, options: NSJSONReadingOptions.MutableContainers, error: nil)
  
  NSLog("the URL: \(readableJSON)")
  </code></pre>