saluttest: silence the queue if we hit an error
saluttest: silence the queue if we hit an error

This a backport of the Gabble commit ee177cfb2a13a8374e2f1037e806b7bc58aa708b

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