Bug 162167 Add API IResultIterator.isEmpty to Data Engine.
Current DTE api do not have a method that can be directly used to tell the client whether an IResultIterator is empty or not.We need to add this api for the convenience sake.
engine/org.eclipse.birt.report.engine.tests/test/org/eclipse/birt/report/engine/api/script/RowDataTest.java
/*******************************************************************************
 * Copyright (c) 2005 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.engine.api.script;
import java.math.BigDecimal;
import java.sql.Blob;