salut_muc_channel_close: emit the closed signal directly if the muc wasn't connected (#18552)
salut_muc_channel_close: emit the closed signal directly if the muc wasn't connected (#18552)

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut