PHILADELPHIA — A Philadelphia judge has ordered philly.com to reveal the name of an anonymous commenter, in a defamation suit brought by electricians’ union leader John Dougherty. An attorney in the case says it could have a broad impact on incendiary online comments and those users, sometimes called “trolls,” who post them anonymously. The anonymous defendant in the suit, disguised by the nonsense name “fbpdplt,” called Dougherty a name in the comments section of an article on the website, one of the properties in the media group that also owns the Philadelphia Inquirer and Daily News.