Fabian Homborg 8391f94081 Improve error for redirections to invalid paths
This finds the first broken component, to help people figure out where
they misspelt something.

E.g.

```
echo foo >/usr/lob/systemd/system/machines.target.wants/var-lib-machines.mount
```

will now show:

```
warning: Path '/usr/lob' does not exist
```

which would help with seeing that it should be "/usr/lib".
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