[Zope] malformed Acess rule breaks zope

[ethan mindlace fremen]

zopistas

I was trying to rewrite the access rule, as per evan's suggestion.  I
was asking for  a slice that wasn't there.  Nothing would then come up:
any page I tried to go to told me that I had an index error.  it
wouldn't acknowledge my change that should have fixed it.

So i went in with __no_before_traverse__ which worked (whew).  Then i
tried to edit the method.  No dice.  Deleting it, however, did work.

Just thought I'd mention it, I dunno why it wouldn't fix.

~ethan