Fix null ref on empty web exception

Author: Layoric

src/AndroidClient/client/src/main/java/net/servicestack/client/JsonServiceClient.java

@@ -200,12 +200,14 @@ public static RuntimeException createException(HttpURLConnection res, int respon
             if (res.getHeaderFields().containsKey(HttpHeaders.ContentType) && Utils.matchesContentType(res.getHeaderField(HttpHeaders.ContentType), MimeTypes.Json)){
                 Gson gson = new Gson();
                 JsonElement element = gson.fromJson(responseBody, JsonElement.class);
-                JsonObject jsonObj = element.getAsJsonObject();
-
-                for (Map.Entry<String,JsonElement> jsonElementEntry : jsonObj.entrySet()) {
-                    if(jsonElementEntry.getKey().toLowerCase().equals("responsestatus")) {
-                        webEx.setResponseStatus(Utils.createResponseStatus(jsonObj.get(jsonElementEntry.getKey())));
-                        break;
+                if(element != null) {
+                    JsonObject jsonObj = element.getAsJsonObject();
+
+                    for (Map.Entry<String,JsonElement> jsonElementEntry : jsonObj.entrySet()) {
+                        if(jsonElementEntry.getKey().toLowerCase().equals("responsestatus")) {
+                            webEx.setResponseStatus(Utils.createResponseStatus(jsonObj.get(jsonElementEntry.getKey())));
+                            break;
+                        }
                     }
                 }
             }

src/AndroidClient/client/src/test/java/net/servicestack/client/tests/JsonServiceClientTests.java

@@ -6,6 +6,7 @@
 import net.servicestack.client.ConnectionFilter;
 import net.servicestack.client.JsonServiceClient;
 
+import net.servicestack.client.WebServiceException;
 import net.servicestack.client.tests.dto.*;
 
 import java.net.HttpURLConnection;
@@ -47,5 +48,20 @@ public void exec(HttpURLConnection conn) {
         assertEquals("Hello, World!", response.getResult());
         assertTrue(passTest[0]);
     }
+//TODO Add service accessible via CI server
+//    public void test_can_parse_empty_404_correctly() {
+//        Boolean passTest = false;
+//        JsonServiceClient localTestClient = new JsonServiceClient("http://localhost:65109/");
+//        Hello request = new Hello()
+//                .setName("World");
+//        try {
+//            localTestClient.get(request);
+//        } catch (WebServiceException ex) {
+//            assertEquals(ex.getStatusCode(),404);
+//            passTest = true;
+//        }
+//
+//        assertTrue(passTest);
+//    }
 
 }