Thread:Project:Support desk/Default output of gender function with no username defined

My doubt is about the default output of   when no username is entered as parameter. As of Niklas Laxström said in 30569, he wrote the feature in a way that, when used in a MediaWiki spacename page, that function addresses the reader of the message, i.e. the currently logged in user. Following that, I recently make this edition at translatewiki (see the edit summary please).

After that, and before editing more pages same way, I was fearing that I would not be right. Then make some searches and couldn't find any inclusion of gender with empty username wherever it was, so I requested a bureaucrat at es:wikipedia to create a test page containing  . The result was a "Not defined" for all readers. Now I'm confused and want to clarify myself about this issue. Does gender function really default to currentuser? If it does, in which circumstances? Note that in Help:Magic words there is no mention of empty username. Please feel free to edit this entry to tweak my English. I'm a es:wikipedia user.