Fix a bug that _process* add movement_group_node into movement_group_node_list even when they should not. The fix requires that movement_group_node_list be prepared by the caller instead of the callee, because it is not feasible to detect how it is called from the callee perfectly.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38258 20353a03-c40f-0410-a6d1-a30d3c3de9de