Sultan does not throw an error on `mv` if the destination directory does not have right permissions

It appears that Sultan isn't throwing any errors if the user doesn't have permissions to do a `mv`. It simply swallows it, and the error doesn't get thrown.

```python
with Sultan.load() as s:
    s.mv(source_file, deployed).run()
```

Also, why is it swallowing errors and not throwing them if it encounters it?