Related to android-async-http#67, avoiding NPE in JsonHttpResponseHandler

Author: smarek

library/src/com/loopj/android/http/JsonHttpResponseHandler.java

@@ -193,6 +193,8 @@ protected void handleSuccessJsonMessage(int statusCode, Header[] headers, Object
     }
 
     protected Object parseResponse(String responseBody) throws JSONException {
+        if(null == responseBody)
+            return null;
         Object result = null;
         //trim the string to prevent start with blank, and test if the string is valid JSON, because the parser don't do this :(. If Json is not valid this will return null
         responseBody = responseBody.trim();