The article names in Google Analytics is based on XML. Usually, all the larger articles are included and the names of the articles will, therefore, be displayed in the Event Label with the Article Event. Sometimes smaller articles/information will not be given a headline in the XML. If this is the case, Google will list the title as 'Untitled'.
To avoid seeing the 'Untitled' label in your reports, you can exclude the untitled articles from your query. This is done by including an extra filter in your Custom Report for the Article Event.
If you have any questions regarding the untitled articles or the Article Event, feel free to contact us.