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Created attachment 145704 [details] proposed patch While searching for the cause of #242495, I came this idea: what happens when a project group is named "(none)". Well it creates it, but then it can't be removed without removing all the other groups. So I think it ought to be prevented. The attached path is an attempt at it. I'm reusing WARN_GroupExists for lack of a better message.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss