From what I understand, the Empty article: “The article body that we extracted from the HTML page appears to be empty.”
Is a content from the HTML, it could be your site empty when crawl by google without www or perhaps not https. If you just type knews.it in your browser it will be redirect to page without content (empty): https://www.knews.it/wp-signup.php?new=knews.it. See screenshot:
Please try fix your site redirection and https configuration before submitting to GoogleNews again.