[issue28144] Decrease empty_keys_struct's dk_refcnt

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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assignee:  -> serhiy.storchaka
components: +Interpreter Core
nosy: +serhiy.storchaka
stage:  -> patch review
type:  -> enhancement
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28144>
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