base: initialize site when creating user preferences

same as group

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Person_createUserPreference.py

@@ -23,5 +23,8 @@ for assignment in context.contentValues(portal_type='Assignment'):
   if group:
     preference.setPreferredSectionCategory(group)
     preference.setPreferredAccountingTransactionSectionCategory(group)
+  site = assignment.getSite(base=True)
+  if site:
+    preference.setPreferredNodeCategory(site)
 
 return preference

bt5/erp5_core_test/TestTemplateItem/portal_components/test.erp5.testERP5Base.py

@@ -1153,7 +1153,8 @@ class TestERP5Base(ERP5TypeTestCase):
   def test_user_creation(self):
     person = self.portal.person_module.newContent(portal_type='Person')
     assignment = person.newContent(portal_type='Assignment',
-                                   group='nexedi/storever')
+                                   group='nexedi/storever',
+                                   site='distibution/tokyo')
     self.assertNotEquals(None, assignment.getGroupValue())
     assignment.open()
     self.portal.portal_workflow.doActionFor(person, 'create_user_action',
@@ -1182,6 +1183,9 @@ class TestERP5Base(ERP5TypeTestCase):
     # for his assignment group
     self.assertEqual('group/nexedi/storever',
         self.portal.portal_preferences.getPreferredSectionCategory())
+    # and assignment function
+    self.assertEqual('site/distibution/tokyo',
+        self.portal.portal_preferences.getPreferredNodeCategory())
 
   def test_default_address_acquisition(self):
     # more complete version of test_04_SubordinationAndAddress