Issue #19648: implement empty tests in pickletester.  Patch by Gennadiy Zlobin.
diff --git a/Misc/ACKS b/Misc/ACKS
index ef6853d..ed5afe7 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1456,4 +1456,5 @@
 Cheng Zhang
 Kai Zhu
 Tarek Ziadé
+Gennadiy Zlobin
 Peter Åstrand