do not fail if Preference type info is not registred in types tool.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@9599 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/PreferenceTool.py

@@ -49,8 +49,11 @@ def createPreferenceMethods(portal) :
   This method must be called on startup.
   """
   attr_list = []
-  pref_portal_type = getToolByName(portal,
-                                  'portal_types')['Preference']
+  typestool = getToolByName(portal, 'portal_types')
+  pref_portal_type = typestool.getTypeInfo('Preference')
+  if pref_portal_type is None:
+    LOG('createPreferenceMethods', PROBLEM,
+           'Preference type information is not installed.')
   # 'Dynamic' property sheets added through ZMI
   zmi_property_sheet_list = []
   for property_sheet in pref_portal_type.property_sheet_list :