[issue36406] doctest.testmod(empty_package) raises TypeError in 3.7 (and no errors in 3.6)

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +17064
pull_request: https://github.com/python/cpython/pull/17592

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36406>
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