erp5_commerce: shopping cart can be None

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

failed ERP5.UnitTest-Master

11:21:00

passed SlapOS.Eggs.UnitTest-Master.Python2

01:40:02

passed ERP5.CodingStyleTest-Master

10:26:16

passed ERP5.CodingStyleTest-Master

01:52:21

failed ERP5.UnitTest-Master

02:22:26

failed ERP5.UnitTest-Master

02:33:21

passed SlapOS.Eggs.UnitTest-Master.Python2

01:28:32

passed SlapOS.Eggs.UnitTest-Master.Python2

01:31:16

passed SlapOS.Eggs.UnitTest-Master.Python2

01:23:57