Add early return for responses page when a form hasn't been saved yet

[timarney]

Summary | Résumé

Fixes issue where a user could land on the responses page with a form that has never been saved (doesn't have form responses).

Adds early return to avoid API lookup which throws

 Forms
 - Template 0000 must have associated owners to access responses

[github-actions[bot]]

:test_tube: Review environment

https://oage3dgwd3rwngx5titsgiwini0pnzhn.lambda-url.ca-central-1.on.aws/

[timarney]

Noting other string will still fall-through but will merge this.