Fix spacing. Replace if not m by if m is not None.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17605 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ERP5Type.py

@@ -227,12 +227,12 @@ class ERP5TypeInformation( FactoryTypeInformation,
 
         m = getattr(p, self.factory, None)
 
-        if m:
+        if m is not None:
             try:
                 # validate() can either raise Unauthorized or return 0 to
                 # mean unauthorized.
                 permission = self.permission
-                if permission and _checkPermission( permission, container ):
+                if permission and _checkPermission(permission, container):
                   return m
                 elif getSecurityManager().validate(p, p, self.factory, m):
                   return m