policy.max_line_length is incorrectly assumed to never be None

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-08-18.20:47:21.272>
labels = ['type-bug', 'expert-email', '3.10']
title = 'policy.max_line_length is incorrectly assumed to never be None'
updated_at = <Date 2021-12-29.03:47:26.359>
user = 'https://bugs.python.org/equaeghe'

bugs.python.org fields:

activity = <Date 2021-12-29.03:47:26.359>
actor = 'andrei.avk'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['email']
creation = <Date 2020-08-18.20:47:21.272>
creator = 'equaeghe'
dependencies = []
files = []
hgrepos = []
issue_num = 41585
keywords = ['patch']
message_count = 4.0
messages = ['375625', '375653', '375691', '409280']
nosy_count = 8.0
nosy_names = ['barry', 'r.david.murray', 'maxking', 'equaeghe', 'Jeffrey.Kintscher', 'iritkatriel', 's.williams-wynn', 'andrei.avk']
pr_nums = ['21955']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41585'
versions = ['Python 3.10']