slapos_panel: Accept None payment_mode

   It must lead to "Contact us" page. Allow us use accounting for other configurations, so it
   allow the user generate a payment and contact us to make the wire transfer or pay from
   some non-automated system.

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/Entity_createExternalPaymentTransactionFromDepositAndRedirect.py

@@ -14,7 +14,6 @@ ledger_uid = portal.portal_categories.ledger.automated.getUid()
 currency_uid = currency_value.getUid()
 
 payment_mode = context.Base_getPaymentModeForCurrency(currency_value.getUid())
-assert payment_mode is not None
 
 outstanding_amount_list = context.Entity_getOutstandingDepositAmountList(
   resource_uid=currency_uid, ledger_uid=ledger_uid)
@@ -40,5 +39,4 @@ payment_transaction = context.Person_restrictMethodAsShadowUser(
   argument_list=[context, deposit_price, currency_value, payment_mode])
 
 web_site = context.getWebSiteValue()
-assert web_site is not None
 return payment_transaction.PaymentTransaction_redirectToManualPayment(web_site=web_site)

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/SaleInvoiceTransaction_createExternalPaymentTransactionFromAmountAndRedirect.py

@@ -10,7 +10,6 @@ assert outstanding_amount.getLedgerUid() == portal.portal_categories.ledger.auto
 assert outstanding_amount.getDestinationSectionUid() == entity.getUid()
 
 payment_mode = outstanding_amount.Base_getPaymentModeForCurrency(outstanding_amount.getPriceCurrencyUid())
-assert payment_mode is not None
 
 def wrapWithShadow(entity, outstanding_amount, payment_mode):
   return entity.Entity_createPaymentTransaction(