Since properties are supported here, is possible that instance_getattr2() raises an exception.  Fix all code that made this assumption.
Since properties are supported here, is possible that
instance_getattr2() raises an exception.  Fix all code that made this
assumption.

Backport candidate.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator