By clicking on Add Group button on Administration/Group Browser page without entering the Name: (Group Name), a group without name is created. But if you try to delete that group, you receive the following message in Delete Group:

page after clicking on Delete button: "Errors Can not delete role actors without a name specified". There are two solutions to resolve this issue: a - To provide a possibility to rename such noname group or b - To provide a possibility to delete such group.