Bug 141255 No error for the incompatible parameter value
Steps to reproduce: 1.New a decimal parameter, set the default value to "aaa" 2.Preview the report by "Preview" tab Expected result: Error to say the incompatible parameter value Actual result: Parameter request page keeps poping up till input the decimal value Note: if preview in Web Viewer, error will be thrown out, but no exception description.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/presentation/aggregation/parameter/ScalarParameterFragment.java
/**
	 * Get report parameters from engine.
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @return target jsp pages
	 * @exception ServletException
	 * @exception IOException
	 */
	protected void doService( HttpServletRequest request,
			HttpServletResponse response ) throws ServletException, IOException
	{
		ViewerAttributeBean attrBean = (ViewerAttributeBean) request
				.getAttribute( "attributeBean" ); 
		assert attrBean != null;
		assert parameter != null;
		ScalarParameterBean parameterBean = new ScalarParameterBean( parameter );
		attrBean.setParameterBean( parameterBean );
		Locale locale = attrBean.getLocale( );
		boolean isDesigner = attrBean.isDesigner( );
		try
		{
			prepareParameterBean( attrBean.getReportDesignHandle( request ),
					getReportService( ), request, parameterBean, parameter,
					locale, isDesigner );
			
			prepareParameterBean( request, getReportService( ), parameterBean,
					locale );