Preview of a not saved form is displaying a generic error message to the user

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.4.1 CE GA2, 7.4.2 CE GA3, 7.4.13 DXP GA1, Master
• Component/s: Forms
• Labels: None
• Fix Priority: 3
• Sprint: Forms_7.4_17
• Git Pull Request: https://github.com/natocesarrego/liferay-portal/pull/1055

Description

When creating a form, when user clicks on Preview button before saving the form, an error message is displayed on the preview of the form. 

Steps to Reproduce

1. Go to Content & Data > Forms > New Form
2. Add any field;
3. Click on the Preview button ;
4. Go back to the form, and Save it;
5. Click again on the Preview button;

Expected Result

The user should be informed of this limitation. The behavior of the Preview button could be similar to the behavior of the Share button, which is enabled only after form is Published.

Actual Result

Upon clicking on the Preview button, the preview of the form is displayed with an error message.

Reproduced In
master: ffd0befc13449e6c0863104e000f812b8ceee005