get_user_pass_cr: get password from stdin if missing inline

get_user_pass_cr: get password from stdin if missing inline

Until now, when HTTP proxy user and password were specified inline,
it was assumed that both creds were specified. A missing password would
result in an empty password being stored.

This behaviour is not ideal, as we want to allow the user to store the
username, but let the password be entered via stdin.

This affects both http proxy and authentication inline'd creds.

Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20220914185937.31423-2-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg25215.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>