Improve officejs bootloader error message display

See merge request !1508
11 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:22:43

failed ERP5.UnitTest-Master

02:10:16

failed ERP5.UnitTest-Master.Medusa

02:28:18

passed SlapOS.Eggs.UnitTest-Master.Python2

00:40:54

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:24

failed ERP5.UnitTest-Master

01:52:19

passed ERP5.UnitTest-Master

01:14:02

passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:26

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:47

passed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.Eggs.UnitTest-Master.Python3

00:15:29