Rewrote all tal:condition in comments.pt. The authenticated user has

the reply button and the comment form if he has the "Reply to item"
permission and the conversation is currently enabled.

Warning:
There is a security hole at the moment. Any authenticated user having the
zope2.View permission or anonymous user without captcha can add a comment
by creating a post request.

svn path=/plone.app.discussion/trunk/; revision=38888

plone/app/discussion/browser/comments.py

@@ -223,7 +223,7 @@ class CommentsViewlet(ViewletBase):
     def has_replies(self, workflow_actions=False):
         """Returns true if there are replies.
         """
-        if self.get_replies(workflow_actions):
+        if self.get_replies(workflow_actions) is not None:
             try:
                 self.get_replies(workflow_actions).next()
                 return True