This is my bad, I'm pretty sure. Was this just trying to get into the ZMI, or was there another application / template which triggered the problem? At any rate, the fix is likely to be to add 'guarded_hasattr' to the list of items which should be wrapped; on the 2.7 branch, this list is at the bottom of AccessControl.Implementation.
Yes. Adding 'hasattr' (the key for guarded_hasattr) to _NEED_WRAPPING seems to fix this issue.
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