title: Swift: How to remove a null value from Dictionary?
body: <p>I'm new in Swift and I have a problem with filtering NULL values from JSON file and setting it into Dictionary. 
  I getting JSON response from the server with null values and it crashes my app. </p>
  
  <p>Here is JSON response:</p>
  
  <pre><code>"FirstName": "Anvar",
  "LastName": "Azizov",
  "Website": null,
  "About": null,
  </code></pre>
  
  <p>I will be very appreciated for help to deal with it.</p>
  
  <p><strong>UPD1:</strong> At this moment I decided to do it in a next way: </p>
  
  <pre><code>if let jsonResult = responseObject as? [String: AnyObject] {                    
      var jsonCleanDictionary = [String: AnyObject]()
  
      for (key, value) in enumerate(jsonResult) {
        if !(value.1 is NSNull) {
           jsonCleanDictionary[value.0] = value.1
        }
      }
  }
  </code></pre>