fix for deleting tags.

string2vector should return an empty vector on ""

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@1576 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/data/listManager.java

@@ -257,8 +257,10 @@ public class listManager {
             }
         }else{
             ret = new Vector();
+            if(!string.equals("")){
             	ret.add(string);
             }
+        }
         return ret;
     }