Feed format with RSS type does not display images
From semantic-mediawiki.org
Fragment of a discussion from Help talk:Feed format
SMWResultPrinter (SMW\ResultPrinter in SMW 1.9) is an abstract class which can't be used directly as a template. If at all you should have a look at SMW\FeedResultPrinter (class in SMW 1.9), it is a final class which means you can't use inheritance, you just have to copy the class and change what ever it is you are looking for.
