pylint #109653 Jython KeyError on Windows with Tentative Fix [open]

I got the following error while running pylint on a fairly large script in Jython on Windows XP. Pylint successfully finishes analyzing the script when this patch is applied.
Traceback (most recent call last):
  File "\jython2.7a2\bin\pylint", line 8, in 
    sys.exit(
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\__init__.py", line 21, in run_pylint
    Run(sys.argv[1:])
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\lint.py", line 929, in __init__
    linter.check(args)
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\lint.py", line 542, in check
    self.check_astng_module(astng, walker, rawcheckers)
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\lint.py", line 615, in check_astng_module
    walker.walk(astng)
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\utils.py", line 556, in walk
    self.walk(child)
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\utils.py", line 556, in walk
    self.walk(child)
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\utils.py", line 553, in walk
    cb(astng)
  File "C:\jython2.7a2\Lib\site-packages\pylint-0.26.0-py2.7.egg\pylint\checkers\typecheck.py", line 168, in visit_getattr
    if is_super(owner) or getattr(owner, 'type', None) == 'metaclass':
  File "C:\jython2.7a2\Lib\site-packages\logilab_astng-0.24.1-py2.7.egg\logilab\astng\bases.py", line 51, in __getattr__
    return getattr(self._proxied, name)
  File "C:\jython2.7a2\Lib\site-packages\logilab_astng-0.24.1-py2.7.egg\logilab\astng\raw_building.py", line 347, in _set_proxied
    return _CONST_PROXY[const.value.__class__]
KeyError: <type 'org.python.core.FloatInfo'>
I made a change within checkers/typecheck.py in order to prevent pylint from crashing. I think that the change is fine, but the exact nature of the crash was a bit cryptic, so someone familiar with the code in the above error should review my change to determine whether it's an appropriate fix. Here's my workaround. Starting on line 169 of checkers/typecheck.py, replace the following lines:
                if is_super(owner) or getattr(owner, 'type', None) == 'metaclass':
                    continue
with these lines:
            try:
                if is_super(owner) or getattr(owner, 'type', None) == 'metaclass':
                    continue
            except KeyError:
                continue
Additional Information: I'm using JDK 6 and my Jython environment has a few very minor patches applied, but I don't think that they're anything that would affect this issue. My pylint environment is clean except for this very small workaround applied because that crash is encountered before this crash.
priorityimportant
typebug
done in<not specified>
closed by<not specified>