After changing the Content Type "Landing Page" so that its field "Description" is no longer required, the Platform UI still doesn't accept the Landing Pages with empty description (see screenshot in the attachment).

Steps to reproduce

1. Create new eZ Platform EE installation.
2. In the Platform UI, go to "Admin panel"/"Content types"/"Content".
3. Edit the "Landing Page" Content Type.
4. In the definition of the "Description" Content Field, unselect "Required" checkbox and save the Content Type.
5. Go to "Page" tab.
6. Edit "Home" Landing Page.
7. In the "Basics" tab, clear "Page Description" field.
8. Click "Publish". The "Page description" field will change to red and the Content Object will not be published (see screenshot in the attachment).