[issue10049] Add a "no-op" (null) context manager to contextlib

[Hrvoje Nikšić]

Hrvoje Nikšić <hniksic at gmail.com> added the comment:

I am of course willing to sign the CLA (please send further instructions via email), although I don't know how useful my original patch is, given that it caches the null context manager.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue10049>
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