Bug 135465 [smoke]An error occurred when new a casading Parameter
Description: An error occurred when new a casading Parameter Step to reproduce: 1.new a sample db data source and data set 2.New a cascading parameter group, named "gp1", 3.select the data set, then create two cascading parameters, one is row["customernumber"], named p1; the other is row["customername"] Actual result; error message occurred repeatly
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
		setResult( inputParameterGroup );
		super.okPressed( );
	}
	private void deleteRow( )
	{
		int index = valueTable.getTable( ).getSelectionIndex( );
		ScalarParameterHandle choice = (ScalarParameterHandle) ( (IStructuredSelection) valueTable.getSelection( ) ).getFirstElement( );
		if ( choice == null )
		{
			return;
		}
		try
		{
			inputParameterGroup.getParameters( ).drop( choice );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
			return;
		}
		refreshValueTable( );
		index--;
		if ( index < 0 && valueTable.getTable( ).getItemCount( ) > 1 )
		{
			index = 0;
		}
		StructuredSelection selection = null;
		if ( index != -1 )
		{