[issue4067] ast.fix_missing_locations() breaks if node doesn't have "_attributes" variable

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

empty_tuple should be DECREF'ed at the end of the function.
Otherwise the patch is fine.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue4067>
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