Avoid crash in client recovery if we don't know the handler well-known-name
Avoid crash in client recovery if we don't know the handler well-known-name

In the case an Observer/Approver Claims the channel, we don't get the
handler well known name for that process. In that case we need to
fallback to lookup all possible handlers on the same process and
pick the first one that match.

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