Do not raise ValueError when searching for an ERP5 user which do not exists or...

Do not raise ValueError when searching for an ERP5 user which do not exists or due to security settings is not accessible to logged in user. Instead return None and let application logic choose appropriate action.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25310 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/ERP5Site_getAuthenticatedMemberPersonValue.xml

@@ -64,8 +64,7 @@ found_user_list = context.portal_catalog(portal_type=\'Person\', \n
                                          reference=user_name)\n
 found_users = len(found_user_list)\n
 if found_users != 1:\n
-  # in an ERP5 system there can exists only one unique username\n
-  raise ValueError, "Found %s users for username \'%s\'" %(found_users, user_name)\n
+  return None\n
 \n
 return found_user_list[0].getObject()\n
 </string> </value>
@@ -111,7 +110,6 @@ return found_user_list[0].getObject()\n
                             <string>found_user_list</string>
                             <string>len</string>
                             <string>found_users</string>
-                            <string>ValueError</string>
                             <string>_getitem_</string>
                           </tuple>
                         </value>

bt5/erp5_base/bt/revision

-513
\ No newline at end of file
+514
\ No newline at end of file