#14835: Make plistlib output empty arrays & dicts like OS X

Patch by Sidney San Martín.
diff --git a/Misc/ACKS b/Misc/ACKS
index 74bf123..3abd77e 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -662,6 +662,7 @@
 Anthony Martin
 Owen Martin
 Sébastien Martini
+Sidney San Martín
 Roger Masse
 Nick Mathewson
 Simon Mathieu