fix for "TypeError: can't pickle OIBTreeItems objects".
svn path=/plone.app.discussion/trunk/; revision=27776
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@ -167,7 +167,8 @@ class Conversation(Traversable, Persistent, Explicit):
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@property
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def commentators(self):
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return self._commentators.keys()
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if len(self._commentators.keys()) != 0:
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return self._commentators.keys()
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def objectIds(self):
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return self._comments.keys()
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