modulefinder chokes on numpy - dereferencing None in spec.loader

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-04-21.07:33:37.811>
labels = ['3.8', 'type-bug', 'library', '3.9']
title = 'modulefinder chokes on numpy - dereferencing None in spec.loader'
updated_at = <Date 2021-10-23.21:13:12.303>
user = 'https://bugs.python.org/GregWhiteley'

bugs.python.org fields:

activity = <Date 2021-10-23.21:13:12.303>
actor = 'FFY00'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-04-21.07:33:37.811>
creator = 'Greg Whiteley'
dependencies = []
files = ['49079']
hgrepos = []
issue_num = 40350
keywords = ['patch']
message_count = 6.0
messages = ['366912', '367856', '367943', '368112', '380087', '404911']
nosy_count = 7.0
nosy_names = ['barry', 'eric.smith', 'dkasak', 'eric.snow', 'FFY00', 'cajetan.rodrigues', 'Greg Whiteley']
pr_nums = ['19917', '29196']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40350'
versions = ['Python 3.8', 'Python 3.9']