[HUDSON-936] Applied the patch from pcc.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@24149 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Queue.java

@@ -904,7 +904,7 @@ public class Queue extends ResourceController implements Saveable {
             
             for (Node n : hash.list(p.task.getFullDisplayName())) {
                 Computer c = n.toComputer();
-                if (c==null)    continue;
+                if (c==null || c.isOffline())    continue;
                 c.startFlyWeightTask(p);
                 return;
             }