Cleaning up error message output

Author: smarek

sample/src/main/java/com/loopj/android/http/sample/MainActivity.java

@@ -64,6 +64,7 @@ private void startRequest() {
             @Override
             public void onSuccess(int statusCode, Header[] headers, String content) {
                 setStatusMessage("Succeeded", Color.parseColor("#DD00FF00"));
+                printThrowable(null);
                 printHeaders(headers);
                 printContents(content);
                 printStatusCode(statusCode);