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/service/actionhandler/BirtRunReportActionHandler.java
IViewerReportDesignHandle designHandle = attrBean
				.getReportDesignHandle( context.getRequest( ) );
		try
		{
			InputOptions options = new InputOptions( );
			options.setOption( InputOptions.OPT_REQUEST, context.getRequest( ) );
			options.setOption( InputOptions.OPT_LOCALE, attrBean.getLocale( ) );
			options.setOption( InputOptions.OPT_RTL, new Boolean( attrBean
					.isRtl( ) ) );
			options.setOption( InputOptions.OPT_IS_DESIGNER, new Boolean(
					attrBean.isDesigner( ) ) );
			Collection parameterList = attrBean.getParameterList( );
			Iterator paramIr = null;
			if ( parameterList != null )
				paramIr = parameterList.iterator( );
			if ( operation != null )
			{
				Oprand[] oprands = operation.getOprand( );
				for ( int i = 0; i < oprands.length; i++ )
				{
					String paramName = oprands[i].getName( );
					Object paramValue = oprands[i].getValue( );
					while ( paramIr != null && paramName != null
							&& paramValue != null && paramIr.hasNext( ) )
					{
						ParameterDefinition parameterObj = (ParameterDefinition) paramIr
								.next( );
						if ( paramName.equals( parameterObj.getName( ) ) )
						{
							ReportParameterConverter converter = new ReportParameterConverter(