avoid NPE when ClientResponseStatus comes back null from Jersey

Author: sammefford

src/main/java/com/marklogic/client/impl/JerseyServices.java

@@ -173,6 +173,7 @@ public JerseyServices() {
 	}
 
 	private FailedRequest extractErrorFields(ClientResponse response) {
+		if ( response == null ) return null;
 		InputStream is = response.getEntityInputStream();
 		try {
 			FailedRequest handler = FailedRequest.getFailedRequest(
@@ -1150,6 +1151,9 @@ else if (failure.getMessageCode().equals("RESTAPI-EMPTYBODY"))
 						"Empty request body sent to server", failure);
 			throw new FailedRequestException("Precondition Failed", failure);
 		}
+		if (status == null) {
+			throw new FailedRequestException("write failed: Unknown Reason", extractErrorFields(response));
+		}
 		if (status != ClientResponse.Status.CREATED
 				&& status != ClientResponse.Status.NO_CONTENT) {
 			throw new FailedRequestException("write failed: "