\#21803 introduced a helper and a cleaner restyling of the ‘Nothing to display’ block that is displayed around the app.

At least the following plugins are now inconsistent in their styling and should be updated to use the new helper:

- Begin of the insertionopenproject-global-rolesEnd of the insertion Begin of the deletion openproject-backlogsEnd of the deletion
- openproject-costs
- openproject-documents
- openproject-meeting