This got broken in the reorg; it's still possible for someone

to be asking for scene updates starting farther back than what 
we know about, so notice that case & return back a null list of 
updates rather than an incomplete one.


git-svn-id: svn+ssh://src.earth.threerings.net/vilya/trunk@575 c613c5cb-e716-0410-b11b-feb51c14d237

src/java/com/threerings/whirled/util/UpdateList.java

@@ -72,6 +72,12 @@ public class UpdateList
      */
     public SceneUpdate[] getUpdates (int fromVersion)
     {
+        // If we don't have updates, or our updates start from someplace later than our fromVersion,
+        // we can't give updates from our known ones.
+        if (_updates.size() == 0 || _updates.get(0).getSceneVersion() > fromVersion) {
+            return null;
+        }
+        
         List<SceneUpdate> updates = Lists.newArrayList();
         for (SceneUpdate update : _updates) {
             if (update.getSceneVersion() >= fromVersion) {