Bugfix for / by zero when the AssortmentCluster is empty

See: http://www.yacy-forum.de/viewtopic.php?t=2746



git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2459 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/plasma/plasmaWordIndexAssortmentCluster.java

@@ -359,7 +359,7 @@ public final class plasmaWordIndexAssortmentCluster extends indexAbstractRI impl
             c += assortments[j].size() * assortments[j].cacheObjectChunkSize();
             k += assortments[j].size();
         }
-        return (int) (c / k);
+        return (k > 0) ? (int) (c / k) : 0;
     }
     
     public int[] cacheNodeStatus() {