check if the category already exists

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13425 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/tests/testImmobilisation.py

@@ -329,6 +329,7 @@ class TestImmobilisationMixin(TestOrderMixin, ERP5TypeTestCase):
     Create a category tree
     """
     for category, codification, vault_type, new_tree in category_tree:
+      if category not in current_category.objectIds():
         new_category = current_category.newContent(portal_type='Category',
                                                    id=category,
                                                    codification=codification)