implement render() instead of cell_call() to match new component api

views/entry.py

@@ -65,7 +65,7 @@
 class BlogEntryWFHistoryVComponent(workflow.WFHistoryVComponent):
     __select__ = workflow.WFHistoryVComponent.__select__ & is_instance('BlogEntry')
 
-    def cell_call(self, row, col, view=None):
+    def render(self, w, **kwargs):
         pass
 
 class BlogEntrySameETypeListView(baseviews.SameETypeListView):