[GREENFOOT-410] Allow UserInfo.getTop(...) to function when not logged in (applets on greenfoot.org website)

See this discussion: http://www.greenfoot.org/topics/7595/0

Implementing this feature request would require: \- updating Greenfoot itself (the relevant functionality is in the shared public jar, so would not require a Greenfoot release to activate) \- update the storage server \- update Greenfoot documentation

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Issue metadata

• Issue type: Task
• Priority: Low