[MERGE][bug #297831] don't call chdir('')

[John Arbash Meinel]

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It seems that on Sun OS calling chdir with an empty path returns an
error EADDR, I guess.

Anyway, this patch just checks that we actually have a path being passed
in before calling chdir. If we prefer, I can change the check to "if
len(path) > 0" but it didn't seem like a big deal either way.

John
=:->
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