Fix issue with empty JSON object responses from network policy endpoints

[resolves #969]

cloudfoundry-client-reactor/src/main/java/org/cloudfoundry/reactor/networking/v1/policies/ReactorPolicies.java

@@ -44,13 +44,15 @@ public ReactorPolicies(ConnectionContext connectionContext, Mono<String> root, T
 
     @Override
     public Mono<Void> create(CreatePoliciesRequest request) {
-        return post(request, Void.class, builder -> builder.pathSegment("policies"))
+        return post(request, Object.class, builder -> builder.pathSegment("policies"))
+            .then()
             .checkpoint();
     }
 
     @Override
     public Mono<Void> delete(DeletePoliciesRequest request) {
-        return post(request, Void.class, builder -> builder.pathSegment("policies", "delete"))
+        return post(request, Object.class, builder -> builder.pathSegment("policies", "delete"))
+            .then()
             .checkpoint();
     }
 

cloudfoundry-client-reactor/src/test/java/org/cloudfoundry/reactor/networking/v1/policies/ReactorPoliciesClientTest.java

@@ -49,6 +49,7 @@ public void create() {
                 .payload("fixtures/networking/policies/POST_request.json")
                 .build())
             .response(TestResponse.builder()
+                .payload("fixtures/networking/policies/POST_response.json")
                 .status(OK)
                 .build())
             .build());
@@ -95,6 +96,7 @@ public void delete() {
                 .payload("fixtures/networking/policies/POST_delete_request.json")
                 .build())
             .response(TestResponse.builder()
+                .payload("fixtures/networking/policies/POST_delete_response.json")
                 .status(OK)
                 .build())
             .build());

cloudfoundry-client-reactor/src/test/resources/fixtures/networking/policies/POST_delete_response.json

@@ -0,0 +1 @@
+{}

cloudfoundry-client-reactor/src/test/resources/fixtures/networking/policies/POST_response.json

@@ -0,0 +1 @@
+{}