slapos_accounting: source_administration is not used anymore on Compute Node

master/bt5/slapos_accounting/SkinTemplateItem/portal_skins/slapos_consumption/ComputerConsumptionTioXMLFile_solveInvoicingGeneration.py

@@ -35,6 +35,7 @@ else:
     # informative.
     if compute_node.getReference() == reference:
       aggregate_value_list = [compute_node]
+      person_relative_url = None
       project = compute_node_project
     else:
       project = None # For now, else we should calculate this too.