X-TELEPATHY-PASSWORD is not mandatory if unimplementable
X-TELEPATHY-PASSWORD is not mandatory if unimplementable

Gabble (correctly) doesn't implement it if you use
{ "account": "gmail.com" }, which is not enough for X-TELEPATHY-PASSWORD:
a mechanism that provides a username, such as PLAIN or Google's OAuth
dialect, must be used here.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=64354
Reviewed-by: Guillaume Desmottes <f16649c7afcd84e3350287183c4ed23cb1aea57c@collabora.co.uk>

TelepathyIM/telepathy-spec,freedesktop-unofficial-mirror/telepathy__telepathy-spec