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/CascadingParametersDialog.java
}
		dataTypeChooser.setText( dataType.findChoice( selectedParameter.getDataType( ) )
				.getDisplayName( ) );
		if ( getInputDisplayName( ) == null )
		{
			displayTypeChooser.clearSelection( ); 
		}
		else
		{
			displayTypeChooser.setText( getInputDisplayName( ) );
		}
		defaultValue = selectedParameter.getDefaultValue( );
		if ( defaultValue == null )
		{
			defaultValueEditor.setText( "" ); 			
		}
		else
		{
			defaultValueEditor.setText( defaultValue );
		}
		helpTextEditor.setText( UIUtil.convertToGUIString( selectedParameter.getHelpText( ) ) );
		if ( selectedParameter.getPropertyHandle( ScalarParameterHandle.LIST_LIMIT_PROP )
				.isSet( ) )
		{
			listLimit.setText( String.valueOf( selectedParameter.getListlimit( ) ) );
		}
		else
		{
			listLimit.setText( "" ); 
		}