SolverTool, as a Type Provider, needs to be handled carefully:

in fact, accessing erp5.portal_types will try loading the contents
of portal_solvers as well...


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41375 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/dynamic/portal_type_class.py

@@ -121,6 +121,8 @@ core_portal_type_class_dict = {
   'Base Type':    {'type_class': 'ERP5TypeInformation',
                    'generating': False},
   'Types Tool':   {'type_class': 'TypesTool',
+                   'generating': False},
+  'Solver Tool': {'type_class': 'SolverTool',
                   'generating': False}
   }