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As the title says. With stuff like bug 31676, we definitely don't want to insert more junk then we have to.

For example:

https://www.mediawiki.org/w/load.php?modules=mediawiki.legacy.wikibits

> mw.loader.implement('mediawiki.legacy.wikibits',function(){ .. },{"":""},{});

that third argument there should be an empty object.

Change-Id: I436a6a1c64452fc60a58fd9a478a2ac2b1328211

* Saves number of <style> tags inserted, which in turn is good for
  IE's stupid stylesheet limit (bug 31676).

* Also saves a little bit of bandwidth by outputting
  {} instead of {"":""}.