Bugfix with toArray().

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4272 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/presents/dobj/DSet.as

@@ -98,7 +98,7 @@ public class DSet
      */
     public function toArray () :Array
     {
-        return _entries.concat(null); // makes a copy
+        return _entries.concat(); // makes a copy
     }
 
     /**