[MERGE] Fix for walkdirs in missing dir with Py2.4 @ win32

[Aaron Bentley]

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John Arbash Meinel wrote:
> John Arbash Meinel has voted +1.
> Status is now: Approved
> Comment:
> Seems reasonable. I wonder if we want to add a standard place for any of
> these windows errors that we are defining.

What drives me batty is that we can't refer to the WindowsError class on
every platform.  Sure, not every platform will raise it, but it would be
much cleaner to do

        except WindowsError, e:
            if e.errno != ERROR_PATH_NOT_FOUND:
                raise
        except OSError, e:
            if e.errno != errno.ENOENT:
                raise


Aaron
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