Bug 153523 OK button in parameter dialog is enabled without default value in combo-box
Description: OK button in parameter dialog is enabled without default value in combo-box Steps to reproduce: 1. New a report parameter, combo-box. 2. Click New button, input abc as value, click OK 3. Set abc as default value and close Edit Parameter dialog. 4. New a data source and dataset 5. Edit the parameter, remove abc value and import values from dataset Expected result: OK button is disabled for there is no default value. Actual result: OK button is enabled.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
{
				dataSetChooser.setText( selectedDataSetName );
			}
		}
	}
	private void refreshColumns( boolean onlyFilter )
	{
		if ( columnChooser == null )
		{
			return;
		}
		if ( !onlyFilter )
		{
			DataSetHandle dataSetHandle = inputParameter.getModuleHandle( )
					.findDataSet( dataSetChooser.getText( ) );
			try
			{
				columnList = DataUtil.getColumnList( dataSetHandle );
			}
			catch ( SemanticException e )
			{
				ExceptionHandler.handle( e );
			}
			displayTextChooser.removeAll( );
			displayTextChooser.add( NONE_DISPLAY_TEXT );
			for ( Iterator iter = columnList.iterator( ); iter.hasNext( ); )
			{
				displayTextChooser.add( ( (ResultSetColumnHandle) iter.next( ) ).getColumnName( ) );
			}
			displayTextChooser.setText( NONE_DISPLAY_TEXT );