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
parameterBean.setRequired( paramDefaultValueObj == null );
				break;
			}
		}
		
		String format = parameter.getPattern( );
		ReportParameterConverter converter = new ReportParameterConverter(
				format, locale );
		String parameterDefaultValue = converter.format( paramDefaultValueObj );
		
		ViewerAttributeBean attrBean = (ViewerAttributeBean) request
				.getAttribute( "attributeBean" ); 
		Map configMap = attrBean.getParameters( );
		if ( configMap != null && configMap.containsKey( parameter.getName( ) ) )
		{
			Object configObj = configMap.get( parameter.getName( ) );
			if ( configObj != null )
			{
				parameterDefaultValue = converter.format( configObj );
			}
		}
		parameterBean.setValue( ParameterAccessor.getReportParameter( request,
				parameter.getName( ), parameterDefaultValue ) );
	}
	protected void prepareParameterBean( HttpServletRequest request,
			IViewerReportService service, ScalarParameterBean parameterBean,
			Locale locale ) throws ReportServiceException
	{
	}
}