Fixed a crash which could occur when taking a photo via the app failed

Session/Media Viewing & Editing/PhotoCapture.swift

@@ -92,14 +92,13 @@ class PhotoCapture: NSObject {
                 self?.session.beginConfiguration()
                 defer { self?.session.commitConfiguration() }
 
-                try self?.updateCurrentInput(position: .back)
+                do { try self?.updateCurrentInput(position: .back) }
+                catch { throw PhotoCaptureError.initializationFailed }
 
                 guard
                     let photoOutput = self?.captureOutput.photoOutput,
                     self?.session.canAddOutput(photoOutput) == true
-                else {
-                    throw PhotoCaptureError.initializationFailed
-                }
+                else { throw PhotoCaptureError.initializationFailed }
 
                 if let connection = photoOutput.connection(with: .video) {
                     if connection.isVideoStabilizationSupported {
@@ -610,7 +609,13 @@ class PhotoCaptureOutputAdaptee: NSObject, ImageCaptureOutput {
         }
 
         func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
-            var data = photo.fileDataRepresentation()!
+            guard var data: Data = photo.fileDataRepresentation() else {
+                DispatchQueue.main.async {
+                    self.delegate?.captureOutputDidFinishProcessing(photoData: nil, error: error)
+                }
+                return
+            }
+            
             // Call normalized here to fix the orientation
             if let srcImage = UIImage(data: data) {
                 data = srcImage.normalizedImage().jpegData(compressionQuality: 1.0)!

Session/Media Viewing & Editing/PhotoCaptureViewController.swift

@@ -12,14 +12,12 @@ protocol PhotoCaptureViewControllerDelegate: AnyObject {
     func photoCaptureViewControllerDidCancel(_ photoCaptureViewController: PhotoCaptureViewController)
 }
 
-enum PhotoCaptureError: Error {
+enum PhotoCaptureError: Error, CustomStringConvertible {
     case assertionError(description: String)
     case initializationFailed
     case captureFailed
-}
 
-extension PhotoCaptureError: LocalizedError {
-    var localizedDescription: String {
+    var description: String {
         switch self {
         case .initializationFailed:
             return NSLocalizedString("PHOTO_CAPTURE_UNABLE_TO_INITIALIZE_CAMERA", comment: "alert title")