mimetypes.init() fails if no access to one of known files

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-11-03.12:33:22.008>
labels = ['3.7', '3.8', 'type-bug', 'library', '3.9']
title = 'mimetypes.init() fails if no access to one of known files'
updated_at = <Date 2019-11-24.18:34:02.321>
user = 'https://bugs.python.org/MichaSzymaniak'

bugs.python.org fields:

activity = <Date 2019-11-24.18:34:02.321>
actor = 'r.david.murray'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-11-03.12:33:22.008>
creator = 'Micha\xc5\x82 Szymaniak'
dependencies = []
files = []
hgrepos = []
issue_num = 38672
keywords = []
message_count = 4.0
messages = ['355897', '355907', '356260', '357406']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'r.david.murray', 'SilentGhost', 'maxking', 'Micha\xc5\x82 Szymaniak']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38672'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']