*) avoid nullpointerException on seed.getAddress() (reported by netbude)

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3431 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/yacy/yacySeedDB.java

@@ -573,6 +573,10 @@ public final class yacySeedDB {
                     seed = (yacySeed) e.nextElement();
                     if (seed != null) {
                         addressStr = seed.getAddress();
+                        if (addressStr == null) {
+                        	serverLog.logWarning("YACY","lookupByIP: address of seed " + seed.getName() + "is null.");
+                        	continue; 
+                        }
                         if ((pos = addressStr.indexOf(":"))!= -1) {
                             addressStr = addressStr.substring(0,pos);
                         }