only unhook destroy handler if the channel proxy is not null
only unhook destroy handler if the channel proxy is not null


20070820163527-b59df-7a98b83fac89345546b3c99d8c3269780261b19d.gz

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