A Dynamic Category Property is an Expression which may return a list

containing None, so just skip such case


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43210 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Utils.py

@@ -1308,6 +1308,11 @@ def getExistingBaseCategoryList(portal, base_cat_list):
 
   new_base_cat_list = []
   for base_cat in base_cat_list:
+    if base_cat is None:
+      # a Dynamic Category Property specifies a TALES Expression which
+      # may return a list containing None, so just skip it
+      continue
+
     key = (base_cat,)
     try:
       value = cache[key]