Presently, only the UI checks that:

• groups are created with names (i.e. not empty strings)

Nothing checks that:

• groups are not renamed to empty strings

• groups are not renamed to that of other groups

This could lead to issues where refactoring introduces bugs, or where plugins cause unhandled exceptions that are difficult for the plugin to catch, understand and feedback to the user.

This should be fixed in the DefaultGroupProvider and tested.