Test if conference element could be created before referencing it
Test if conference element could be created before referencing it

freedesktop-unofficial-mirror/telepathy__telepathy-farsight,freedesktop-unofficial-mirror/telepathy__telepathy-farsight,freedesktop-unofficial-mirror/telepathy__telepathy-farsight,freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farstream