Bug 201205 Exception occurs in dataset preview when IN filter contains a blank value[0802]
Description: Exception occurs in dataset preview when IN filter contains a blank value[0802] Build number: 2.2.1.v20070827-0630 Steps to reproduce: 1, New a sampleDB customer dataset 2, New a filter and operator is IN 3, Specify a blank value and add 4, Preview in dataset Expected result: The preview should be successful and no exception Actual result: Exception occurs Error log: org.eclipse.birt.report.designer.core.runtime.GUIException: Caused by java.lang.reflect.InvocationTargetException. at org.eclipse.birt.report.designer.core.runtime.GUIException.createGUIException(GUIException.java:76) at org.eclipse.birt.report.designer.internal.ui.util.ExceptionHandler.handle(ExceptionHandler.java:169) at org.eclipse.birt.report.designer.internal.ui.util.ExceptionHandler.handle(ExceptionHandler.java:150) at org.eclipse.birt.report.designer.internal.ui.util.ExceptionHandler.handle(ExceptionHandler.java:89) at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage.updateResultsProcess(ResultSetPreviewPage.java:515) at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage.runUpdateResults(ResultSetPreviewPage.java:274) at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage.access$1(ResultSetPreviewPage.java:244) at org.eclipse.birt.report.designer.data.ui.dataset.ResultSetPreviewPage$4.runInUIThread(ResultSetPreviewPage.java:237)
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java
* 
	 * @param obj
	 * @param operator
	 * @param op1
	 * @param op2
	 * @return A Boolean result
	 * @throws DataException
	 */
	public static Object evalConditionalExpr( Object obj,
			int operator, Object[] ops )
			throws DataException
	{
		ExprTextAndValue[] opTextAndValue = new ExprTextAndValue[ops.length]; 
		for( int i=0; i< ops.length; i++ )
		{
			opTextAndValue[i] = createExprTextAndValueInstance( ops[i] );
		}
		
		Object resultObject = obj;
		Object[] resultOp = new Object[ops.length];
		for( int i=0; i< ops.length; i++ )
		{
			resultOp[i] = opTextAndValue[i].value;
		}
		Object[] obArray = MiscUtil.isComparable( obj, operator, opTextAndValue );
		if ( obArray != null )
		{
			resultObject = obArray[0];
			for ( int i = 1; i < obArray.length; i++ )
			{