Add NoneType check for the 'aff' argument to Affinity Rules management logic of the 'Decort.Controller.compute_affinity' method.

module_utils/decort_utils.py

@@ -1245,7 +1245,7 @@ class DecortController(object):
         if comp_dict['affinityRules']:
             for rule in comp_dict['affinityRules']:
                 del rule['guid']
-                if rule not in aff:
+                if not aff or rule not in aff:
                     affrule_del.append(rule)
 
         if aff: