STEPS TO REPRODUCE
- Edit a page with CKEditor
- On toolbar, click on 'Insert > Other Macros'
- Search and/or observe the 'Attachment Picker' Macro
The 'Attachment Picker' Macro has assigned a category.
No category seems to be assigned for it.
In XWiki 14.4.4 it was assigned to 'Other' category which doesn't exist in 14.8 RC1.