[issue30409] locale.getpreferredencoding doesn't return result

[STINNER Victor]

STINNER Victor added the comment:

> In fact, it seems like I introduced a regression in bpo-6393, commit 94a3694c3dda97e3bcb51264bf47d948c5424d84.

I backported this commit, but I didn't notice the bug in the code... In fact, this commit was followed by the commit 6a448d4c2eac16af4c451b43c6dc46cf287b1671.

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<http://bugs.python.org/issue30409>
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