Null Pointer Exception in SelectItemsIterator.next() if binding is null

NPE is thrown at line 183 of org.apache.myfaces.shared_impl.util.SelectItemsIterator.next() if value binding property of the current UISelectItems component is null. This is not relevant, as the exception expected at that place in the code is IllegalArgumentException. By constructing the IllegalArgumentException message, a check whether the binding is null should be made, like it's done at line 143 of the same class.