Comment 27 for bug 1998494

Some of our libraries do create items with only a prefix and no call number label for items in browsing collections. The use of a prefix saves inputting time and provides consistent data. I tested this on https://tiffany-master.gapines.org/eg2/en-US/staff/ to make sure that functionality was intact with this patch, and it is. With the Library Setting "Require call number labels in Copy Editor" set to false, I was able to save an item with only a prefix and no call number label. I was not able to save an item with a prefix and no call number label when the Library Setting was set to true.