Walter's ipipe patch: If calling a function in _getattr() raises an AttributeError, return the default. Make xattrs() more robust: If calling __xattrs__() raises an exception fall back to (None,). Make xrepr() more robust: If calling __repr__() raises an exception fall back to using repr(). Replace a generator expression with a list comprehension in the _BrowserLevel constructor so that ipipe stays Python 2.3 compatible. Fix handling of empty lists in ibrowse: You can not enter empty lists, and the browser displays an empty screen with the message <empty>.