Add missing finish. Oops.

Sources/Etcetera/ImageCache.swift

@@ -71,7 +71,7 @@ public final class ImageCache {
  private let urlSession: URLSession
  private let formattingTaskRegistry = TaskRegistry<ImageKey, Image?>()
  private let downloadTaskRegistry = TaskRegistry<ImageKey, DownloadResult?>()
- private let userImageDiskTaskRegistry = TaskRegistry<ImageKey, Void>()
+ private let userImageDiskTaskRegistry = TaskRegistry<ImageKey, URL>()
  private let memoryCache = MemoryCache<ImageKey, Image>()
  private let formattingQueue: OperationQueue
  private let workQueue: OperationQueue
@@ -200,23 +200,24 @@ public final class ImageCache {
  completion(nil)
  return
  }
- let fileUrl = self.fileUrl(forOriginalImageWithKey: actualKey)
  var saveOperation: Operation?
  _ = self.userImageDiskTaskRegistry.addRequest(
  taskId: actualKey,
  workQueue: self.workQueue,
  taskExecution: { finish in
  let blockOperation = BlockOperation {
+ let fileUrl = self.fileUrl(forOriginalImageWithKey: actualKey)
  FileManager.default.save(image, to: fileUrl)
+ finish(fileUrl)
  }
  saveOperation = blockOperation
  self.formattingQueue.addOperation(blockOperation)
  }, taskCancellation: {
  saveOperation?.cancel()
- }, taskCompletion: {
+ }, taskCompletion: { _ in
  // no-op
- }, requestCompletion: {
- completion(fileUrl)
+ }, requestCompletion: { url in
+ completion(url)
  }
  )
  }