fixed comment (is->if)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2324 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -293,7 +293,7 @@ class Base( CopyContainer, PortalContent, ActiveObject, ERP5PropertyManager ):
     global aq_portal_type
     ptype = self.portal_type
     
-    # Is this is a portal_type property and everything is already defined
+    # If this is a portal_type property and everything is already defined
     # for that portal_type, try to return a value ASAP
     if aq_portal_type.has_key(ptype):
       return getattr(aq_portal_type[ptype], id, None)