Better handling of empty list

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4560 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ERP5Type_asSecurityGroupId.xml

@@ -80,10 +80,11 @@ code_list = []\n
 # sort the category list lexicographically\n
 # this prevents us to choose the exact order we want,\n
 # but also prevents some human mistake to f*ck everything up by creating site_function instead of function_site\n
-category_list = []\n
-if category_order not in (None, \'\', (), []):\n
-  category_list = [ x for x in category_order]\n
-category_order = category_list.sort()\n
+if category_order not in (None, \'\'):\n
+  category_order = [ x for x in category_order]\n
+  category_order.sort()\n
+else:\n
+  category_order = []\n
 \n
 for base_category in category_order:\n
   category        = kw[base_category]\n
@@ -99,29 +100,28 @@ return \'_\'.join(code_list)\n
         </item>
         <item>
             <key> <string>_code</string> </key>
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         </item>
         <item>
             <key> <string>_filepath</string> </key>
@@ -158,7 +158,6 @@ PG1vZHVsZT4BAAAAcwAAAAA=</string> </value>
                             <string>category_order</string>
                             <string>kw</string>
                             <string>code_list</string>
-                            <string>category_list</string>
                             <string>None</string>
                             <string>append</string>
                             <string>$append0</string>