Bug 180608 [Regression]NPE throws out when preview the result in dataset[07]
Description: [Regression]NPE throws out when preview the result in dataset[07] Build number: 2.2.0.v20070403-0630 Steps to reproduce: 1, Use attached report 2, Edit Data Set 3, Preview the Data Set Expected result: The preview should be success Actual result: NPE throws out Error log:
data/org.eclipse.birt.data.tests/test/org/eclipse/birt/data/engine/binding/FeaturesTest.java
* Test feature of the usage of Expression Data Type
	 * 
	 * @throws Exception
	 */
	public void testAggrExprAndInconvertibleDataType( ) throws Exception
	{
		Object[] expectedValue = new Object[]{
				Boolean.TRUE,
				"CHINA",
				Boolean.FALSE,
				ResourceConstants.WRAPPED_BIRT_EXCEPTION,
				Boolean.TRUE,
				Timestamp.valueOf( "2004-01-01 00:00:00.0" ),
				Boolean.TRUE,
				Integer.class
		};
		String[] bindingNameRow = new String[]{
				"ROW_COUNTRY", "ROW_CITY", "ROW_SALE_DATE", "ROW_AMOUNT"
		};
		IBaseExpression[] bindingExprRow = new IBaseExpression[]{
				new ScriptExpression( "dataSetRow.COUNTRY",
						DataType.STRING_TYPE ),
				new ScriptExpression( "dataSetRow.CITY", DataType.INTEGER_TYPE ),
				new ScriptExpression( "dataSetRow.SALE_DATE",
						DataType.UNKNOWN_TYPE ),
				new ScriptExpression( "Total.sum(dataSetRow.AMOUNT)",
						DataType.INTEGER_TYPE )
		};
		IBaseExpression[] expressions = new IBaseExpression[]{
				new ScriptExpression( "row.COUNTRY", DataType.STRING_TYPE ),