On demo: content --> "CmsSite" --> CMS:
Right click on one of the items to add "New Long Text" or "Image".
After saving the new content:
Edit WebSite CMS For: 
"There is no Content PUBLISH_POINT for this WebSite!"
Having the same problem on a 17.12 local installation.
- is broken by
OFBIZ-5048 Multi Part Input Parameters not Available in Groovy Event