allero validate local doesn't fail when the path doesn't exist

[idanshahar]

To Reproduce
Steps to reproduce the behavior:

1. run allero validate {path that doesn't exist}

Expected behavior
Print an error message - "The path doesn't exist, re-run allero validate on an existing directory or run allero fetch to fetch from a remote repository and rerun allero validate"

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS] - MacOS
• Version [e.g. 22] - 0.0.18