Bug 207250 Check blank value for datetime type parameter from url.[0002][0705]
Description: Check blank value for datetime type parameter from url. Build number:2.3.0.v20071023 Steps to reproduce: 1. New a datetime parameter mydt,listbox, tick off isRequired. 2. Preview in external browser and add "&dt=" in url, press enter. Expected result: Error message to indicate blank value isn't allowed for this parameter. Actual result: No error message and blank value is accepted. I tried to new a jsp and use <birt:paramDef> to pass the blank value and the blank value is accepted,too. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
this.moduleOptions = BirtUtility.getModuleOptions( request );
		this.reportDesignHandle = getDesignHandle( request );
		if ( this.reportDesignHandle == null )
			throw new ViewerException(
					ResourceConstants.GENERAL_EXCEPTION_NO_REPORT_DESIGN );
		
		ParameterAccessor.setClean( request );
		
		__initParameters( request );
	}
	/**
	 * Prepare the report parameters
	 * 
	 * @param request
	 * @throws Exception
	 */
	protected void __initParameters( HttpServletRequest request )
			throws Exception
	{
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		options.setOption( InputOptions.OPT_LOCALE, locale );
		options.setOption( InputOptions.OPT_RTL, new Boolean( rtl ) );
		
		this.parameterDefList = getReportService( ).getParameterDefinitions(
				this.reportDesignHandle, options, false );
		
		
		if ( this.isDesigner
				&& ( IBirtConstants.SERVLET_PATH_RUN.equalsIgnoreCase( request