[issue28780] netrc throws NetrcParseError for record without 'password'

Changes by Xiang Zhang : -- dependencies: +Improve the netrc library ___ Python tracker ___

[issue28780] netrc throws NetrcParseError for record without 'password'

New submission from Mark Wood: netrc.netrc() throws a NetrcParseError if ~/.netrc contains an entry witout a 'password' field. Other users of .netrc do not do this. In my case, I have entries for sftp hosts which will use public-key authentication instead of a password. What I would