Steps to reproduce:
- Create a new content type with two fields: Text Line (not required); Image Asset (not required);
- Create a new content item with a new content type. Specify the name and do not upload or select image;
- Click on preview and then click back.
Actual result: Preview is empty. When going back there is an error message.
Expected result: there is a preview. There is no error message.
Error message text: