Tentative fix.

When we log off, anything that tries to unsubscribe in response to that
will find that the object cache is already cleared, resulting in these
info-level warnings cluttering up the log.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6773 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/main/java/com/threerings/presents/client/ClientDObjectMgr.java

@@ -250,7 +250,11 @@ public class ClientDObjectMgr
         _flusher.cancel();
         _flushes.clear();
         _dead.clear();
-        _ocache.clear();
+        _client.getRunQueue().postRunnable(new Runnable() {
+            public void run () {
+                _ocache.clear();
+            }
+        });
     }
 
     protected <T extends DObject> void queueAction (int oid, Subscriber<T> target, boolean subscribe)