PyDict_Copy() can leave 'ma_version

PyDict_Copy() can leave 'ma_version_tag' uninitialized

BPO	33199
Nosy	@rhettinger, @methane, @pdox, @miss-islington
PRs	bpo-33199: Initialize ma_version_tag in PyDict_Copy #6341 [3.7] bpo-33199: Initialize ma_version_tag in PyDict_Copy (GH-6341) #6357 [3.6] bpo-33199: Initialize ma_version_tag in PyDict_Copy (GH-6341) #6358

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-04-03.03:37:04.195>
created_at = <Date 2018-04-01.08:56:59.843>
labels = ['interpreter-core', '3.8', 'type-bug', '3.7']
title = "PyDict_Copy() can leave 'ma_version_tag' uninitialized"
updated_at = <Date 2018-04-03.03:37:15.971>
user = 'https://github.com/pdox'

bugs.python.org fields:

activity = <Date 2018-04-03.03:37:15.971>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2018-04-03.03:37:04.195>
closer = 'methane'
components = ['Interpreter Core']
creation = <Date 2018-04-01.08:56:59.843>
creator = 'pdox'
dependencies = []
files = []
hgrepos = []
issue_num = 33199
keywords = ['patch']
message_count = 4.0
messages = ['314768', '314851', '314853', '314854']
nosy_count = 4.0
nosy_names = ['rhettinger', 'methane', 'pdox', 'miss-islington']
pr_nums = ['6341', '6357', '6358']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33199'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']