getPortalAssignmentBaseCategoryList must return a list, not a tuple

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4284 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/ERP5Site.py

@@ -526,7 +526,11 @@ class ERP5Site ( CMFSite, FolderMixIn ):
       """
         Return List of category values to generate security groups.
       """
-       return self._getPortalConfiguration('portal_assignment_base_category_list')
+      category_tuple = self._getPortalConfiguration('portal_assignment_base_category_list')
+      category_list = []
+      if category_tuple not in (None, '', (), []):
+        category_list = [ x for x in category_tuple]
+      return category_list
 
     security.declareProtected(Permissions.AccessContentsInformation, 'getDefaultModuleId')
     def getDefaultModuleId(self, portal_type):