simplify generator lookup logic on BusinessTemplates

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30822 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -5073,12 +5073,9 @@ Business Template is a set of definitions, such as skins, portal types and categ
         self.checkDependencies()
 
       site = self.getPortalObject()
-      custom_generator_class = getattr(site, '_generator_class', None)
-      if custom_generator_class is not None:
-        gen = custom_generator_class()
-      else:
-        from Products.ERP5.ERP5Site import ERP5Generator
-        gen = ERP5Generator()
+      from Products.ERP5.ERP5Site import ERP5Generator
+      generator_class = getattr(site, '_generator_class', ERP5Generator)
+      gen = generator_class()
       # update activity tool first if necessary
       if self.getTitle() == 'erp5_core' and self.getTemplateUpdateTool():
         LOG('Business Template', 0, 'Updating Activity Tool')