Added a hasResult method for whenever someone needs it.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2080 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/util/ResultHandler.java

@@ -27,6 +27,14 @@ public class ResultHandler<T>
         }
     }
 
+    /**
+     * Checks whether the result (or error, if the request failed) is already available.
+     */
+    public boolean hasResult ()
+    {
+        return (_list == null);
+    }
+
     /**
      * Peeks at the result, which will be returned if already available.  If the result is pending
      * or there was an error, this method returns <code>null</code> (which, however, will also be