Destroy a clone even if the clone container does not exist

Goal

If a container does not exist, it is impossible to remove the clone

$ dblab clone destroy webui-ixxx
2021/07/20 20:13:48 unexpected clone given: &{webui-ixxx 0xc000435f80 false  2021-07-09 15:49:12 UTC {FATAL RunnerError(cmd="HIDDEN", inerr="exit statu
s 1", stderr="Error: No such container: dblab_clone_6024
" exit="1")} {host=localhost port=6024 user=joe_58 dbname=dblab localhost 6024 joe_58  dblab} {57462784 55 MiB 24.624301734 720}}

TODO / How to implement

Delete the clone entry and free the port even if the required container is not present

Acceptance criteria