slapos_payzen: Allow the a Superuser/Manager invoke redirect to pay

This allow us to produce links to third parties pay someones invoices (if they have Manager account).

master/bt5/slapos_payzen/SkinTemplateItem/portal_skins/slapos_payzen/PaymentTransaction_redirectToManualPayzenPayment.py

-from zExceptions import Unauthorized
-
 portal = context.getPortalObject()
 person = portal.ERP5Site_getAuthenticatedMemberPersonValue()
 
 if getattr(context, "PaymentTransaction_getVADSUrlDict", None) is None:
   raise ValueError("PaymentTransaction_getVADSUrlDict is missing on this site")
 
-if person is None:
-  raise Unauthorized("Error")
-
 def wrapWithShadow(payment_transaction, person_relative_url):
 
   vads_url_dict = payment_transaction.PaymentTransaction_getVADSUrlDict()
@@ -30,6 +25,9 @@ def wrapWithShadow(payment_transaction, person_relative_url):
   return system_event.contentValues(
     portal_type="Payzen Event Message")[0].getTextContent()
 
+if person is None:
+  return wrapWithShadow(context, context.getDestinationSection())
+
 return person.Person_restrictMethodAsShadowUser(
   shadow_document=person,
   callable_object=wrapWithShadow,