Patron Group is a required field. The UNAM development team modeled CRUD Fee/Fine Owner after Patron Group, and while testing Fee/Fine Owner I realized it has similar problems to Patron Groups.
1. The first time I tried to enter a blank Patron Group, I got an unfriendly system error message rather than a user friendly one (see attached ScreenPrint1.jpg).
2. I then entered the Description and left the Patron Group blank. I did not get an error message this time. The entry was saved with a blank. (See attached ScreenPrint2.jpg).
3. I then deleted the blank entries and tried entering a blank Patron Group again (#1 above). This time it went through without an error message. (See attached ScreenPrint3.jpg).
4. I then tried #2 above again. This time I received the error message show in attached Screenprint4.jpg.
The results are very inconsistent. For this test I used Chrome at http://folio-snapshot-stable.aws.indexdata.com/settings/users on March 14, 2018.