slapos_erp5: No need constraint to None Creation Date

   The object will be reindexed regardless with the recent upgrades (due various factors), so this is end up as a duplicated check.
5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

02:27:36

failed SlapOS.Eggs.UnitTest-Master.Python2

00:25:13

failed SlapOS.Eggs.UnitTest-Master.Python3

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failed SlapOS.Eggs.UnitTest-Master.Python3

00:26:04

failed SlapOS.Eggs.UnitTest-Master.Python3

00:25:07