UIImagePickerController在图像捕获时崩溃。
请参阅crashlytics捕获的日志：
*** setObjectForKey：对象不能为nil（key：UIImagePickerControllerOriginalImage）
Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x182ec81c0 __exceptionPreprocess
1 libobjc.A.dylib 0x18190055c objc_exception_throw
2 CoreFoundation 0x182da979c -[__NSCFNumber hash]
3 PhotoLibrary 0x18f9e5974 __CreateInfoForImage
4 PhotoLibrary 0x18f9e564c PLNotifyImagePickerOfImageAvailability
5 CameraUI 0x198443d14 -[CAMImagePickerCameraViewController _handleCapturedImagePickerPhotoWithCropOverlayOutput:]
6 CameraUI 0x198443628 -[CAMImagePickerCameraViewController cropOverlayWasOKed:]
7 UIKit 0x188d467b0 -[UIApplication sendAction:to:from:forEvent:]
8 UIKit 0x188d46730 -[UIControl sendAction:to:forEvent:]
9 UIKit 0x188d30be4 -[UIControl _sendActionsForEvents:withEvent:]
10 UIKit 0x188d4601c -[UIControl touchesEnded:withEvent:]
11 UIKit 0x188d45b44 -[UIWindow _sendTouchesForEvent:]
12 UIKit 0x188d40d8c -[UIWindow sendEvent:]
13 UIKit 0x188d11858 -[UIApplication sendEvent:]
14 UIKit 0x1894fecb8 __dispatchPreprocessedEventFromEventQueue
15 UIKit 0x1894f8720 __handleEventQueue
16 CoreFoundation 0x182e76278 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
17 CoreFoundation 0x182e75bc0 __CFRunLoopDoSources0
18 CoreFoundation 0x182e737c0 __CFRunLoopRun
19 CoreFoundation 0x182da2048 CFRunLoopRunSpecific
20 GraphicsServices 0x184825198 GSEventRunModal
21 UIKit 0x188d7c628 -[UIApplication _run]
22 UIKit 0x188d77360 UIApplicationMain
23 newbe 0x1002a2a60 main (AppDelegate.swift:22)
24 libdispatch.dylib 0x181d845b8 (Missing)