[Zope] Problem with moving from Zope2.6.0 to 2.7.1

[Piotr Kral]

Hello

I'm trying to upgrade our application from Zope 2.6.0 to 2.7.1 and I've
encountered a problem. At the beginning I thought It was a DCOracle2
problem, but it seems to be a zope security thing. When I call script
(attached below) under zope 2.6.0 it works fine but under 2.7.1 it says:
###
Error Type: Unauthorized
Error Value: The container has no security assertions. Access to None of
(exceptions.Exception instance at 0xb53a13cc) denied.
###
and I'm logged out.
The script looks like this:
####
try:
    raise Exception('p1', 'p2')
    print x

except Exception, (errNr, errStr):
    print errNr
    print errStr

return printed
#####

How Can I do something to change this behavior? I'd rather to avoid
changing the script because there are hundred's of similar in the
application.

Kind regards
Piotr Kral