Task #9893: Always supply a "used_rcus" property when inserting claims

SAS/ResourceAssignment/ResourceAssigner/lib/assignment.py

@@ -696,6 +696,8 @@ class ResourceAssigner():
                 used_rcus = needed_resources[db_rcu_type_id]
                 claim_size = used_rcus.count('1')
                 claim['used_rcus'] = used_rcus
+            else:
+                claim['used_rcus'] = None
 
             claim['claim_size'] = claim_size
             claimable_resources[res_type]['available_capacity'] -= claim_size