fix for web structure if there is no web structure

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@8088 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/WatchWebStructure_p.java

@@ -71,6 +71,7 @@ public class WatchWebStructure_p {
             sb.webStructure.referencesCount(DigestURI.hosthash6(host)) == 0) {
             // find domain with most references
             besthost = sb.webStructure.hostWithMaxReferences();
+            if (besthost == null) besthost = host;
         } else {
             besthost = host;
         }