Avoid a warning when trying to store a NULL value
Avoid a warning when trying to store a NULL value

e17b83fec8f01ca6977cb4fe259a83634aa90b26 only fixed the !ENABLE_GNOME_KEYRING
case.

https://bugs.freedesktop.org/show_bug.cgi?id=39796

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control