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

@@ -257,7 +257,9 @@ public class listManager {
             }
         }else{
             ret = new Vector();
-            ret.add(string);
+            if(!string.equals("")){
+            	ret.add(string);
+            }
         }
         return ret;
     }