title: Swift - NSUserDefaults Having value or not?
body: <p>My App crashing due to Empty or null value from NSUserDefaults. How to validate NSUSerdefaults Having value or not?</p>
  
  <pre><code>let empName = NSUserDefaults.standardUserDefaults().stringForKey("EMP_NAME")
  
          lblUserName.text = "Hello I'm \(empName!)"
  </code></pre>