Back to the zero-arg ctor for OccupantInfo derivatives.

git-svn-id: svn+ssh://src.earth.threerings.net/vilya/trunk@1066 c613c5cb-e716-0410-b11b-feb51c14d237

src/main/java/com/threerings/stage/data/StageOccupantInfo.java

@@ -35,6 +35,11 @@ public class StageOccupantInfo extends OccupantInfo
         super(body);
     }
 
+    /** Used for unserialization. */
+    public StageOccupantInfo ()
+    {
+    }
+
     /**
      * Should return true if the occupant in question is available to be
      * clustered with, false if they are "busy". This means that a user