if(blog.getFieldsMap().get(AtomXPath.summary)== null)
blog.setSummary(blog.getSummary());
if(!blog.getFieldsMap().toString().contains(BlogXPath.tags.toString()))
blog.setTags(blog.getTags());
BlogSerializer serializer = new BlogSerializer(blog);
String payload = serializer.updatePayload();
String updateBlogUrl = BlogUrls.GET_UPDATE_REMOVE_BLOG.format(this, BlogUrlParts.blogHandle.get(defaultHomepageHandle), BlogUrlParts.entryAnchor.get(blog.getUid()));
Response response = updateData(updateBlogUrl, null, payload, null);
checkResponseCode(response, HTTPCode.OK);
}