PDP-D APPS CL - PDP-X: guard invocation fails which results in DENY handling for usecases

[2019-05-17T17:19:52.905+00:00|INFO|PolicyGuardXacmlHelper|Thread-67] Guard Decision Request:
{"ONAPName":"Policy","ONAPComponent":"Drools PDP","ONAPInstance":"usecase template","requestId":"da0e4e01-6139-41c2-931d-2b540174f2f4","action":"guard","resource":{"guard":

{"actor":"APPC","clName":"ControlLoop-vFirewall-d0a1dfc6-94f5-4fd4-a5b5-4630b438850a","recipe":"ModifyConfig","target":"70a51e42-1355-4753-9288-2f782003ee8a"}

}}

[2019-05-17T17:19:53.015+00:00|ERROR|RestManager|Thread-67] Request failed to policy-xacml-pdp
org.apache.http.client.ClientProtocolException: null
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:187)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at org.onap.policy.rest.RestManager.sendRequest(RestManager.java:171)
at org.onap.policy.rest.RestManager.post(RestManager.java:107)
at org.onap.policy.guard.PolicyGuardXacmlHelper.callRestfulPdp(PolicyGuardXacmlHelper.java:122)
at org.onap.policy.guard.PolicyGuardXacmlHelper.callPdp(PolicyGuardXacmlHelper.java:93)
at org.onap.policy.guard.CallGuardTask.run(CallGuardTask.java:125)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.http.ProtocolException: Target host is not specified
at org.apache.http.impl.conn.DefaultRoutePlanner.determineRoute(DefaultRoutePlanner.java:71)
at org.apache.http.impl.client.InternalHttpClient.determineRoute(InternalHttpClient.java:125)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
... 8 common frames omitted
[2019-05-17T17:19:53.015+00:00|ERROR|PolicyGuardXacmlHelper|Thread-67] Guard rest call returned a null pair - defaulting
Guard rest call returned a null pair - defaulting to DENY