do not raise an exception if a web site has no subject.

bt5/erp5_km/SkinTemplateItem/portal_skins/erp5_km_theme/template_erp5_km_minimal.xml

@@ -105,7 +105,7 @@
                              is_right_area_empty python:right_list == 0 or len(right_list) == 0;\n
                              is_front_layout python: layout_form is not None and\n
                                                      layout_form.id == \'erp5_km_minimal_front_layout\';\n
-                             subject_list python:here.getLayoutProperty(\'subject_list\');\n
+                             subject_list python:here.getLayoutProperty(\'subject_list\') or [];\n
                              global header_title python:\'%s | %s\' % (here.getTranslatedTitleOrId(), website.getTranslatedTitleOrId());\n
                              global css_list_template python:[\n
                                     \'%s/erp5_listbox.css\' % portal_path,\n

bt5/erp5_km/bt/revision

-1811
+1812
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