When some (invalid) arches are filtered out, we can have empty list. Don't spawn such task.
rebased onto 80f7e39c5f65048474a94dc70d8cc8197136e5cf
:thumbsup:
Commit 005d0a5c fixes this pull-request
Pull-Request has been merged by mikem
When some (invalid) arches are filtered out, we can have empty list. Don't spawn such task.