When moving the clean function there, this check was not ported and
generated some errors on the CI. `deleteContainer` now fail if any
error but the clean function won't if "no such container" (because of
some races -_-).
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Upstream-commit: 5dd89abdf1ec3e633ce01e74d1c47f8eb02fa31e
Component: engine