Lower severity of log when portal type class is broken

Lower severity to WARNING because there are legitimate cases, like old objects
in the trash.
An ERROR log (catched by LogInterceptor) was making testBusinessTemplate fail.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39861 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/dynamic/lazy_class.py

@@ -5,7 +5,7 @@ from Products.ERP5Type.Globals import InitializeClass
 from Products.ERP5Type.Base import Base as ERP5Base
 from ExtensionClass import ExtensionClass, pmc_init_of
 from ZODB.broken import Broken, PersistentBroken
-from zLOG import LOG, ERROR, BLATHER
+from zLOG import LOG, WARNING, BLATHER
 
 from portal_type_class import generatePortalTypeClass
 
@@ -122,7 +122,7 @@ class PortalTypeMetaClass(ExtensionClass):
     try:
       baseclasses, attributes = generatePortalTypeClass(portal_type)
     except AttributeError:
-      LOG("ERP5Type.Dynamic", ERROR,
+      LOG("ERP5Type.Dynamic", WARNING,
           "Could not access Portal Type Object for type %r"
           % portal_type, error=sys.exc_info())
       baseclasses = (ERP5BaseBroken, )