Bug 124597 Error message pop up which from length of JS-Expression is error
Details: Error message pop up which from length of JS-Expression is error Setp: 1.New a datasource and dataset contain "row["First"]" 2.Insert a table in layout and a data in details 3.Input "row["FIRST"].length" in data expression 4.Preview Actual result: "FIRST" is a error input words, but it can preview some words in table: org.eclipse.birt.data.engine.script.DataExceptionMocker@1502283 But it has not pop up some error message. Expection result: Pop up an error message
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
* @param odiResult
	 * @param scope
	 * @return
	 * @throws DataException
	 */
	static Object evaluateCompiledExpression( CompiledExpression expr,
			org.eclipse.birt.data.engine.odi.IResultIterator odiResult,
			Scriptable scope ) throws DataException
	{
		
		
		if ( expr instanceof ColumnReferenceExpression )
		{
			
			ColumnReferenceExpression colref = (ColumnReferenceExpression) expr;
			if ( colref.isIndexed( ) )
			{
				int idx = colref.getColumnindex( );
				
				if ( idx == 0 )
					return new Integer( odiResult.getCurrentResultIndex( ) );
				else if ( odiResult.getCurrentResult( ) != null )
					return odiResult.getCurrentResult( )
							.getFieldValue( idx );
				else
					return null;
			}
			else
			{
				String name = colref.getColumnName( );