Revert changes: the bug must be corrected in ERP5Type_asSecurityGroupId instead of here.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4549 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/ERP5Site.py

@@ -549,11 +549,7 @@ class ERP5Site ( CMFSite, FolderMixIn ):
       """
         Return List of category values to generate security groups.
       """
-      category_tuple = self._getPortalGroupedCategoryList('assignment') or 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
+      return self._getPortalGroupedCategoryList('assignment') or self._getPortalConfiguration('portal_assignment_base_category_list')
 
     security.declareProtected(Permissions.AccessContentsInformation, 'getDefaultModuleId')
     def getDefaultModuleId(self, portal_type):