slapos_accounting: Skip garbage from the report

   If partition is None, it means the computer was reformated and there is garbage on it. It is meaningless to process this.

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

@@ -48,7 +48,7 @@ else:
         portal_type="Compute Partition",
         validation_state="validated")
 
-      if partition.getSlapState() != 'busy':
+      if partition is None or partition.getSlapState() != 'busy':
         continue
 
       assert partition.getSlapState() == 'busy', "partition %s is not busy" % reference