check if the comment is not already published, before publishing.

svn path=/plone.app.discussion/trunk/; revision=27723

plone/app/discussion/browser/moderation.py

@@ -147,6 +147,8 @@ class BulkActionsView(BrowserView):
         for path in self.paths:
             comment = context.restrictedTraverse(path)
             portal_workflow = getToolByName(comment, 'portal_workflow')
+            current_state = portal_workflow.getInfoFor(comment, 'review_state')
+            if current_state != 'published':
                 portal_workflow.doActionFor(comment, 'publish')
             catalog = getToolByName(comment, 'portal_catalog')
             catalog.reindexObject(comment)