ring-text-manager: TpBaseChannel is not dispose-safe
ring-text-manager: TpBaseChannel is not dispose-safe

Do not run dispose when removing if channel is being destroyed.

maemo-foss/meego-cellular-telepathy-ring,matthewvogt/telepathy-ring,matthewvogt/telepathy-ring,freedesktop-unofficial-mirror/telepathy__telepathy-ring,freedesktop-unofficial-mirror/telepathy__telepathy-ring,freedesktop-unofficial-mirror/telepathy__telepathy-ring,maemo-foss/meego-cellular-telepathy-ring,maemo-foss/meego-cellular-telepathy-ring,jpoutiai/telepathy-ring,matthewvogt/telepathy-ring,jpoutiai/telepathy-ring,jpoutiai/telepathy-ring