Blog plugin gets partially installed

I Installed Banner, but not Blog. Then, when I edit and save a Banner document, I get a stack trace on the console, complaining about the non-existence of the node type "essentials:blogpost".

Workaround is to delete /hippo:configuration/hippo:modules/essentials-eventbus-listener/@hipposys:className temporarily. If you install the blog feature later on, you will have to restore this property.