quickfix for http://www.yacy-forum.de/viewtopic.php?p=19482#19482

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2042 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/plasma/plasmaSwitchboardQueue.java

@@ -131,7 +131,9 @@ public class plasmaSwitchboardQueue {
 
     public Entry pop() throws IOException {
         if (sbQueueStack.size() == 0) return null;
-        return new Entry(sbQueueStack.pot());
+        byte[][] b = sbQueueStack.pot();
+        if (b == null) return null;
+        return new Entry(b);
     }
 
     public Entry remove(int index) throws IOException {