A hotfix for ERP5 sites which do not yet have inside ZODB instance of portal_callables tool.

product/ERP5Type/patches/CMFCoreSkinnable.py

@@ -68,9 +68,13 @@ Skinnable.SkinnableObjectManager.initializeCache = CMFCoreSkinnableSkinnableObje
 def skinResolve(self, selection, name):
   try:
     portal_skins = aq_base(self.portal_skins)
-    portal_callables = aq_base(self.portal_callables)
   except AttributeError:
     raise AttributeError, name
+  try:
+    portal_callables = aq_base(self.portal_callables)
+  except AttributeError:
+    # backwards compatability for ERP5 sites without this tool
+    portal_callables = None
   try:
     skin_selection_mapping = portal_skins._v_skin_location_list
     reset = False