                     if error.code != NSFileWriteFileExistsError {
                         NSLog("Failed to move legacy data for url \(url) from \(filepath) to path \(diskCachePath)"
                             + "due to error \(error)")
-                        return (empty, error)
+                        return
                     }
                 }
                 
 
                
             }
-            return (empty, nil)
         }
     }
 

                    if error.code != NSFileWriteFileExistsError {
                        NSLog("Failed to create directory for migrated image data for url \(url) at path \(diskCachePath)"
                            + "due to error \(error)")
                        return (empty, error)
                    }
                }
                


        weak var wself = self
        return dispatch_promise(on: dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {
            if let sself = wself {
                let diskCachePath = sself.imageManager.imageCache.defaultCachePathForKey(self.cacheKeyForURL(url))
                let diskCacheURL = NSURL(fileURLWithPath: diskCachePath)
                
                do{
