netrc throws NetrcParseError for record without 'password'

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-11-23.16:18:23.195>
labels = ['type-bug', 'library']
title = "netrc throws NetrcParseError for record without 'password'"
updated_at = <Date 2016-11-26.11:15:20.420>
user = 'https://bugs.python.org/MarkWood'

bugs.python.org fields:

activity = <Date 2016-11-26.11:15:20.420>
actor = 'xiang.zhang'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-11-23.16:18:23.195>
creator = 'Mark Wood'
dependencies = ['28806']
files = []
hgrepos = []
issue_num = 28780
keywords = []
message_count = 1.0
messages = ['281567']
nosy_count = 1.0
nosy_names = ['Mark Wood']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28780'
versions = ['Python 3.4']