[issue1785] "inspect" gets broken by some descriptors

[Dieter Maurer]

Dieter Maurer added the comment:

In "dm.zdoc" (a "pydoc" wrapper for Zope) I simply filter out all names
returned by "dir" which cannot be "getattr"ed.
But, I am not sure, that this is good enough to be accepted as a patch
(although it already improves upon the current state)

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