[merge] better try/finally blocks in readdir_pyx

[John Arbash Meinel]

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Martin Pool wrote:
> I noticed while looking at John's readdir fix that we should be a bit
> more careful of an error occurring after chdir in readdir_pyx.  It's
> unlikely to happen, but being stuck in the wrong directory would be
> pretty confusing.
> 
> 


BB:approve

Do you want to put in the "if path != ''" fix while you're at it?

John
=:->

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