[alohalytics] Default empty callback for files processing in the queue.

1 files changed, 2 insertions, 1 deletions

diff --git a/3party/Alohalytics/src/messages_queue.h b/3party/Alohalytics/src/messages_queue.h
index f8eb3e3636..6d51f7f592 100644
--- a/3party/Alohalytics/src/messages_queue.h
+++ b/3party/Alohalytics/src/messages_queue.h
@@ -100,7 +100,8 @@ class MessagesQueue final {
   // Processing stops if processor returns false.
   // Optional callback is called when all files are processed.
   // Executed on the WorkerThread.
-  void ProcessArchivedFiles(TArchivedFileProcessor processor, TFileProcessingFinishedCallback callback) {
+  void ProcessArchivedFiles(TArchivedFileProcessor processor,
+                            TFileProcessingFinishedCallback callback = TFileProcessingFinishedCallback()) {
     std::lock_guard<std::mutex> lock(mutex_);
     commands_queue_.push_back(std::bind(&MessagesQueue::ProcessArchivedFilesCommand, this, processor, callback));
     condition_variable_.notify_all();