Minor sonarcloud (#76)

Author: Tim Middleton

coherence-visualvm-plugin/src/main/java/com/oracle/coherence/plugin/visualvm/helper/HttpRequestSender.java

@@ -1708,7 +1708,7 @@ private URLBuilder modifyTarget(ObjectName objectName, URLBuilder urlBuilder)
                     return urlBuilder.addPathSegment("operatingSystem");
                     }
             default:
-                return null;
+                return urlBuilder;
             }
         }