R1:8377bb363710

Raise a tailored error message on "show-outbound --id cat"

Summary: Fixes T12579. Unclear why the user ran this command.

Test Plan: Ran with `--id cat`. Ran with `--id 123`.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12579

Differential Revision: https://secure.phabricator.com/D17719