Bug 143671 [Linux-As][Smoke]Parameter can't be used.
Details: [Linux-As]Parameter can't be used. Setp: 1.New a report design. 2.New a paremeter. 3.Preview and click Run Report Parameter. 4.Dialog pop up and press OK. Actual resutl: Report error.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
if ( paramMap == null || !paramMap.containsKey( ISOName ) )
		{
			value = defaultValue;
		}
		Set nullParams = getParameterValues( request, PARAM_ISNULL );
		if ( nullParams != null && nullParams.contains( name ) )
		{
			value = null;
		}
		return value;
	}
	/**
	 * Get result set name.
	 * 
	 * @param request
	 * @return
	 */
	public static String getResultSetName( HttpServletRequest request )
	{
		return getReportParameter( request, PARAM_RESULTSETNAME, null );
	}
	/**
	 * Get solected column name list.
	 * 
	 * @param request
	 * @return
	 */
	public static Collection getSelectedColumns( HttpServletRequest request )
	{
		ArrayList columns = new ArrayList( );