title: IOS - CNContactPickerViewController should display only the names that has an email?
body: <p>I just want to get the name and email from the mobile contact and print it. I'm using the following code to do this task. </p>
  
  <pre><code>import UIKit
  import ContactsUI
  class ViewController: UIViewController, CNContactPickerDelegate{
  
          override func viewDidLoad() {
              super.viewDidLoad()
  
          }
  
          override func didReceiveMemoryWarning() {
              super.didReceiveMemoryWarning()
  
          }
  
  
          @IBAction func button(_ sender: Any)
          {
              let contactPicker = CNContactPickerViewController()
              contactPicker.delegate = self
              contactPicker.displayedPropertyKeys =
                  [CNContactNicknameKey
                    ,CNContactEmailAddressesKey]
  
              self.present(contactPicker, animated: true, completion: nil)
  
          }
          func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact)
          {
              if let emailValue : CNLabeledValue = contact.emailAddresses.first
              {
                  print(emailValue.value as String)
              }
  
              print(contact.givenName + " " + contact.familyName)
  
          }
      }
  </code></pre>
  
  <p>It prints the name and email that I select in CNContactPickerViewController, even if the selected name does not have an email, it just prints the name alone.
  Now, what i want is, I don't want to display the names that has no email, in the CNContactPickerViewController. Only names that has email stored along with it, should be displayed. How can i do that ?</p>
  
  <p>Using Xcode 8.2, Swift 3, IOS 10</p>
  
  <p><strong>NOTE:</strong> I don't want to check whether the email exists or not, or is it valid or not.</p>