Bug 144106 [Regression]Parameter request page pops up twice while running the report with cascading parameter
Steps to reproduce: 1.Add a cascading parameter group with a parameter 2.Preview Expected result: The parameter request page just pops up once for input value Actual result: The parameter request page pops up twice when inputting parameter value
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
*            HttpServletRequest
	 * @param options
	 *            InputOptions
	 * 
	 * @return Map
	 */
	protected Map getParsedParameters( IViewerReportDesignHandle design,
			Collection parameterList, HttpServletRequest request,
			InputOptions options ) throws ReportServiceException
	{
		assert parameterList != null;
		assert parametersAsString != null;
		Map params = new HashMap( );
		for ( Iterator iter = parameterList.iterator( ); iter.hasNext( ); )
		{
			ScalarParameterHandle parameter = null;
			Object parameterObj = iter.next( );
			if ( parameterObj instanceof ScalarParameterHandle )
			{
				parameter = (ScalarParameterHandle) parameterObj;
			}
			
			if ( parameter == null )
				continue;
			String paramName = parameter.getName( );
			Object paramValueObj = parametersAsString.get( paramName );
			if ( paramValueObj != null )
			{
				
				try