[issue17556] os.path.join() converts None to '' by default

[R. David Murray]

R. David Murray added the comment:

I think it is probably better to keep the error, myself.  It seems to me that a None creeping in is more likely to be an error in the program.   But I could be convinced otherwise :)

What is your use case?

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nosy: +r.david.murray
versions:  -Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.5

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