From 045a926621720446feb338b526bd7c0e22534265 Mon Sep 17 00:00:00 2001
From: Timo Stollenwerk <timo@zmag.de>
Date: Thu, 2 Jul 2009 16:04:02 +0000
Subject: [PATCH] fix for "TypeError: can't pickle OIBTreeItems objects".

svn path=/plone.app.discussion/trunk/; revision=27776
---
 plone/app/discussion/conversation.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/plone/app/discussion/conversation.py b/plone/app/discussion/conversation.py
index b28054f..2f824d6 100644
--- a/plone/app/discussion/conversation.py
+++ b/plone/app/discussion/conversation.py
@@ -167,7 +167,8 @@ class Conversation(Traversable, Persistent, Explicit):
 
     @property
     def commentators(self):
-        return self._commentators.keys()
+        if len(self._commentators.keys()) != 0:
+            return self._commentators.keys()
 
     def objectIds(self):
         return self._comments.keys()