[issue29778] _Py_CheckPython3 uses uninitialized dllpath when embedder sets module path with Py_SetPath

[Steve Dower]

Changes by Steve Dower <steve.dower at python.org>:


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stage:  -> needs patch
type:  -> behavior
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29778>
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