fix for http://bugs.yacy.net/view.php?id=24

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7664 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/yacy/graphics/WebStructureGraph.java

@@ -139,7 +139,8 @@ public class WebStructureGraph {
         int LCount = 0;
         while (it.hasNext()) {
             u = it.next();
-            if (u.getHost().equals(refhost)) {
+            if (u == null) continue;
+            if (refhost != null && u.getHost() != null && u.getHost().equals(refhost)) {
                 // this is a local link
                 LCount++;
             } else {