[issue23225] selectors: raise an exception if the selector is closed

[STINNER Victor]

STINNER Victor added the comment:

Oh, I forgot Python 3.4. Changing the behaviour of get_key() in a minor Python version (3.4.x) would break the compatibility. I used Martin Richard's patch for Python 3.4: raise a KeyError if the selector is closed.

I commit my change to Python 3.5 and Tulip.

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