erp5_hal_json_style: ensure select list result can be sent as JSON

10 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:38:31

passed ERP5.PerformanceTest-Master

00:22:49

failed ERP5.UnitTest-Master

01:17:54

failed ERP5.UnitTest-Master.Medusa

01:19:26

passed SlapOS.Eggs.UnitTest-Master.Python2

00:08:12

passed SlapOS.Eggs.UnitTest-Master.Python3

00:37:49

passed SlapOS.Eggs.UnitTest-Master.Python2

00:11:26

passed SlapOS.Eggs.UnitTest-Master.Python2

00:13:17

passed SlapOS.Eggs.UnitTest-Master.Python3

00:09:26

passed SlapOS.Eggs.UnitTest-Master.Python3

00:15:48