ERP5LoginUserManager: Check Assignment is only meaningfull for Persons

The Assigments are only relevant if the User is based on Person Document, on SlapOS, an user come from a Computer or a Software Instance Document. This change makes the document compatible with other kinds of Users, as Assigment is overkill for Non-Person cases, as the presence of ERP5 Login is enough to determinate the User existence. 

The other alternative would be re-factorize to not duplicate code, which seems not the intention of how this code was written. 

/cc @jerome, @kazuhiko 



/reviewed-on nexedi/erp5!458

product/ERP5Security/ERP5LoginUserManager.py

@@ -113,6 +113,7 @@ class ERP5LoginUserManager(BasePlugin):
       return
     if user_value.getValidationState() == 'deleted':
       return
+    if user_value.getPortalType() in ('Person', ):
       now = DateTime()
       for assignment in user_value.contentValues(portal_type="Assignment"):
         if assignment.getValidationState() == "open" and (