[issue28528] Pdb.checkline() attribute error when 'curframe' is None

[miss-islington]

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


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pull_requests: +24691
pull_request: https://github.com/python/cpython/pull/26051

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28528>
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