exceptions for better testing of bug http://www.yacy-forum.de/viewtopic.php?p=9852#9852

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@769 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/kelondro/kelondroTree.java

@@ -217,7 +217,14 @@ public class kelondroTree extends kelondroRecords implements Comparator {
                         found = false;
                         return;
                     }
-		    otherkey = new String(thenode.getKey());
+                    if (thenode == null) {
+                        throw new kelondroException(filename, "kelondroTree.searchproc: thenode==null");
+                    }
+                    try {
+                        otherkey = new String(thenode.getKey());
+                    } catch (NullPointerException e) {
+                        throw new kelondroException(filename, "kelondroTree.searchproc: nullpointer" + e.getMessage());
+                    }
 		    if (visitedNodeKeys.containsKey(otherkey)) {
                         // we have loops in the database.
                         // to fix this, all affected nodes must be patched