slapos_panel: more assertion when creating a virtual master

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

@@ -53,7 +53,9 @@ customer.newContent(
 
 # Compute Node trade condition
 if is_compute_node_payable:
-  source_section_value = subscription_request.getDestinationSectionValue()
+  source_section_value = subscription_request.getDestinationSectionValue(None)
+  if source_section_value is None:
+    raise AssertionError('No source section found to generate the invoices')
   title = 'Payable Compute Node for: %s' % project.getTitle()
 else:
   source_section_value = None
@@ -73,7 +75,9 @@ sale_trade_condition.validate()
 
 # Instance Tree trade condition
 if is_instance_tree_payable:
-  source_section_value = subscription_request.getDestinationSectionValue()
+  source_section_value = subscription_request.getDestinationSectionValue(None)
+  if source_section_value is None:
+    raise AssertionError('No source section found to generate the invoices')
   title = 'Payable Instance Tree for: %s' % project.getTitle()
 else:
   source_section_value = None