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

[Alexander Belchenko]

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Aaron Bentley пишет:
> 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

On Linux using of WindowsError will raise NameError,
because it undefined on non-win32.

[µ]
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