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/BirtCacheParameterActionHandler.java
/**
	 * Constructor.
	 * 
	 * @param context
	 * @param operation
	 */
	public BirtCacheParameterActionHandler( IContext context,
			Operation operation, GetUpdatedObjectsResponse response )
	{
		super( context, operation, response );
	}
	protected void __execute( ) throws RemoteException
	{
		ViewerAttributeBean attrBean = (ViewerAttributeBean) context.getBean( );
		try
		{
			
			String reportDesignName = attrBean.getReportDesignName( );
			
			String configFileName = reportDesignName.replaceFirst(
					IBirtConstants.SUFFIX_DESIGN_FILE,
					IBirtConstants.SUFFIX_DESIGN_CONFIG );
			
			SessionHandle sessionHandle = DesignEngine.newSession( ULocale
					.getDefault( ) );
			File configFile = new File( configFileName );
			
			if ( configFile != null && configFile.exists( )
					&& configFile.isFile( ) )
			{