Description:
Has been working great for years until 4.45.0 update today introduces new crash, seen below.

Additional info:
getmail version 4.45.0
Python version 2.7.6 (default, Feb 26 2014, 12:07:17)
[GCC 4.8.2 20140206 (prerelease)]

Unhandled exception follows:
File "/usr/bin/getmail", line 866, in main
success = go(configs, options.idle)
File "/usr/bin/getmail", line 156, in go
retriever.initialize(options)
File "/usr/lib/python2.7/site-packages/getmailcore/_retrieverbases.py", line 978, in initialize
self._connect()
File "/usr/lib/python2.7/site-packages/getmailcore/_retrieverbases.py", line 295, in _connect
if ssl and self.conf['ca_certs']:
KeyError: 'ca_certs'

$ getmail --getmaildir=/home/mark --rcfile=/home/mark/somedir/getmailrc -da --dump
getmail version 4.45.0
Copyright (C) 1998-2012 Charles Cazabon. Licensed under the GNU GPL version 2.
getmail configuration:
getmail version 4.45.0
Python version 2.7.6 (default, Feb 26 2014, 12:07:17)
[GCC 4.8.2 20140206 (prerelease)]
retriever: SimplePOP3SSLRetriever(certfile="None", delete_dup_msgids="False", getmaildir="/home/mark", keyfile="None", password="*", port="995", server="mail.gandi.net", timeout="180", use_apop="False", username="mark@somedomain.net")
destination: Maildir(filemode="384", path="/home/mark/somedir/Maildir/", user="None")
options:
delete : True
delete_after : 0
delete_bigger_than : 0
delivered_to : True
fingerprint : False
logfile : None
max_bytes_per_session : 0
max_message_size : 0
max_messages_per_session : 0
message_log : None
message_log_syslog : False
message_log_verbose : False
read_all : True
received : True
verbose : 2

## getmailrc:
[retriever]
type = SimplePOP3SSLRetriever
port = 995
server = mail.gandi.net
username = mark@somedomain.net
password = somePassWord

[destination]
type = Maildir
path = /home/mark/somedir/Maildir/

[options]
verbose = 2
read_all = false
delete = true


Steps to reproduce:
As seen above.