title: Crash _assertionFailure with imagePickerController
body: <p>I've following crash log from crashlytics and code below.</p>
  <p>I'm aware that fatalError will crash app. What I wanted to ask is that if there is anything wrong with the code snippet which may be causing error and if we can avoid it?</p>
  <pre><code>Crashed: com.apple.main-thread
  0  libswiftCore.dylib             0x1b013b5c4 _assertionFailure(_:_:file:line:flags:) + 800
  1  MyApp                0x1045d7d34 specialized ChatController.imagePickerController(_:didFinishPickingMediaWithInfo:) + 1632 (ChatController.swift:1632)
  2  MyApp                0x1045d2c1c @objc ChatController.imagePickerController(_:didFinishPickingMediaWithInfo:) + 4343098396 (&lt;compiler-generated&gt;:4343098396)
  3  UIKitCore                      0x1a63368bc -[UIImagePickerController _imagePickerDidCompleteWithInfo:] + 120
  4  UIKitCore                      0x1a63361b8 __60-[UIImagePickerController didSelectMediaWithInfoDictionary:]_block_invoke + 48
  5  libdispatch.dylib              0x1a25a2ec4 _dispatch_call_block_and_release + 32
  6  libdispatch.dylib              0x1a25a433c _dispatch_client_callout + 20
  7  libdispatch.dylib              0x1a25b0600 _dispatch_main_queue_callback_4CF + 832
  8  CoreFoundation                 0x1a287f41c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
  9  CoreFoundation                 0x1a287a034 __CFRunLoopRun + 1708
  10 CoreFoundation                 0x1a2879660 CFRunLoopRunSpecific + 480
  11 GraphicsServices               0x1acc8a604 GSEventRunModal + 164
  12 UIKitCore                      0x1a6a4e15c UIApplicationMain + 1944
  13 MyApp                0x1043f37a0 main + 21 (ProfileViewController.swift:21)
  14 libdyld.dylib                  0x1a26f51ec start + 4
  </code></pre>
  <p>ChatController.swift:</p>
  <pre><code>func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])
  {
      
      guard let selectedImage = info[.originalImage] as? UIImage else {
          // Following line is 1632
          fatalError(&quot;Error: Expected a dictionary containing an image, but was provided the following: \(info)&quot;)
      }
      // other code...
  }
  </code></pre>