feat: when inputForms is empty, ConfigPanel set hide

[Constaline]

Summary

When inputForms is empty, ConfigPanel set hide. Handle this issue #1365 .

Checklist

[!IMPORTANT]
Please review the checklist below before submitting your pull request.

• [ ] This change requires a documentation update, included: Dify Document
• [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.
• [x] I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

Please fix the lint errors.

[crazywoola]

I think this can be closed now, in new versions, we can start chat immediately if there is nothing to be filled.