Bug 177296 Redundant Values are added to parameter list in preview mode.[0705]
Description: Redundant Values are added to parameter list in preview mode. Build number:2.2.0.v20070312 Steps to reproduce: 1. Open attached report. 2. Preview. 3. Select datetime value and click OK. 4. Click Show Report Parameters button, check values Expected result: Values are unchanged and only one datetime value in list. Actual result: Two same datetime values in list.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/actionhandler/BirtGetCascadeParameterActionHandler.java
* Constructor.
	 * 
	 * @param context
	 * @param operation
	 */
	public BirtGetCascadeParameterActionHandler( IContext context,
			Operation operation, GetUpdatedObjectsResponse response )
	{
		super( context, operation, response );
	}
	protected void __execute( ) throws Exception
	{
		ViewerAttributeBean attrBean = (ViewerAttributeBean) context.getBean( );
		assert attrBean != null;
		Oprand[] params = operation.getOprand( );
		Map paramMap = new LinkedHashMap( );
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, context.getRequest( ) );
		IViewerReportDesignHandle designHandle = attrBean
				.getReportDesignHandle( context.getRequest( ) );
		Map cascParamMap = null;
		for ( int i = 0; i < params.length; i++ )
		{
			Oprand param = params[i];
			String paramName = param.getName( );
			boolean isLocale = false;
			
			if ( ParameterAccessor.PARAM_ISNULL.equalsIgnoreCase( paramName ) )
			{
				paramMap.put( param.getValue( ), null );