[issue3773] Check for errors when using PyTokenizer_FindEncoding()

[Amaury Forgeot d'Arc]

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

pgen does not exist on Windows...

What if I simply remove the call to PyErr_NoMemory?
It is not strictly necessary: the function already returns NULL without
an exception set, for example when the file cannot be opened.

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<http://bugs.python.org/issue3773>
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