SSL Certificate identification not working on MacOS

[sysid]

The following lines are failing on MacOS:

try:
    os.path.isfile('/etc/ssl/certs/ca-certificates.crt')
    CA_CERTS = '/etc/ssl/certs/ca-certificates.crt'
except Exception:
    import certifi
    CA_CERTS = certifi.where()

the expression os.path.isfile returns a bool and therefore the try/except clause is ineffective. On MacOS this results in the following error:

[ERROR] network_handler(): HTTPSConnectionPool(host='www.alexblackie.com', port=443): Max retries exceeded with url: /articles/email-authenticity-dkim-spf-dmarc/?utm_source=hackernewsletter&utm_medium=email&utm_term=fav (Caused by SSLError(FileNotFoundError(2, 'No such file or directory')))

[jarun]

I don't own a Mac. If you can fix and confirm please raise a PR.