Added check for Ghost-CLI logs in CI
Added check for Ghost-CLI logs in CI

no issue

- we might fail the tests but not produce any logs in Ghost-CLI
- concatenating the logs would then fail because of the lack of existence
  of a directory
- this commit adds a check that files exist before trying to get the
  contents of the files

TryGhost/Ghost,TryGhost/Ghost,e10/Ghost,e10/Ghost,TryGhost/Ghost