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
{
			
			paramValueObj = this.parameterMap.get( paramName );
			
			paramValueObj = ParameterValidationUtil.getDisplayValue( null,
					parameter.getPattern( ), paramValueObj, locale );
		}
		if ( paramValueObj != null )
			paramValue = paramValueObj.toString( );
		return paramValue;
	}
	/**
	 * get parsed parameters as string.
	 * 
	 * @param parameterList
	 *            Collection
	 * @param request
	 *            HttpServletRequest
	 * @param options
	 *            InputOptions
	 * 
	 * @return Map
	 */
	protected Map getParsedParametersAsString( Collection parameterList,
			HttpServletRequest request, InputOptions options )
			throws ReportServiceException
	{
		assert parameterList != null;
		Map params = new HashMap( );
		for ( Iterator iter = parameterList.iterator( ); iter.hasNext( ); )