Other playbooks maybe expecting this to be at least an empty string. I think they default it to an empty list if its not found.

roles/openshift_facts/library/openshift_facts.py

@@ -1652,6 +1652,7 @@ def set_proxy_facts(facts):
         )
 
         if not proxy_settings_defined:
+            common['no_proxy'] = ''
             return facts
 
         # As of 3.6 if ANY of the proxy parameters are defined in the