Undo this, the NPE will happen automatically..

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2650 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/util/AbstractIntSet.java

@@ -99,10 +99,7 @@ public abstract class AbstractIntSet extends AbstractSet<Integer>
     @Override // from AbstractSet<Integer>
     public boolean add (Integer i)
     {
-        if (i == null) {
-            throw new NullPointerException();
-        }
-        return add(i.intValue());
+        return add(i.intValue()); // will NPE
     }
 
     @Override // from AbstractSet<Integer>