It's not possible to publish empty Landing Page.

Steps to reproduce:
1. Login as admin
2. Go to Page
3. Start creating a new Landing Page
4. Switch to fields view
5. Enter Title and Description
6. Publish

Expected:
Landing Page is published correctly

Actual:
Exception:

Type error: Argument 2 passed to EzSystems\EzPlatformPageFieldType\Event\PageToPersistenceEvent::__construct() must be of the type array, null given