Print helpful message when xavier CLI is called with no arguments #75
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Changes
When
xavieris run with no arguments, print a more helpful error message.Code adapted from renee: https://github.com/CCBR/RENEE/blob/3f01a0d3bfa0a819f8d3360ddfc3335f76ede6ac/renee#L2501-L2503
Issues
Fixes #72
PR Checklist
(
Strikethroughany points that are not applicable.)[ ] Update docs if there are any API changes.CHANGELOG.mdwith a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/