fix for npe in crawler

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4777 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/crawler/CrawlEntry.java

@@ -218,8 +218,8 @@ public class CrawlEntry {
 
     public String initiator() {
         // returns the hash of the initiating peer
-        if (initiator == null) return null;
-        if (initiator.length() == 0) return null; 
+        if (initiator == null) return "";
+        if (initiator.length() == 0) return ""; 
         return initiator;
     }