Markdown clip download fails if website does not have a 'title' tag

[WetHat]

Found in: https://www.developmentsimplyput.com/post/strategy-design-pattern-in-net-c

Despite a missing <title> tag the browser displays a reasonable title. However, the website cannot be clipped because pageTitle is empty. The extension silently fails to download anything. The solution appears to be to make sure the DOM string passed into getArticleFromDom (background.js) contains a <title> tag.