Fix upload members for deleted groups

See #2134 (closed)

This fixes the error of misding group info and puts the problem in the name column.

gui/src/components/uploads/EditMembersDialog.spec.js

@@ -278,5 +278,5 @@ test.each([
   const rows = within(dialog).queryAllByTestId('datatable-row')
   expect(rows.length).toBe(2)
   checkRow(rows[0], { texts: ['Markus Scheidgen', 'Main author'], isDeletable: false })
-  checkRow(rows[1], { texts: ['Group with ID group23 was not found', 'Co-author']})
+  checkRow(rows[1], { texts: ["ERROR: Group with ID 'group23' was not found", 'Co-author']})
 })