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
ResourceConstants.GENERAL_EXCEPTION_DOCUMENT_ACCESS_ERROR,
						new String[]{this.reportDocumentName} );
			}
			
			reportDocumentInstance = ReportEngineService.getInstance( )
					.openReportDocument( this.reportDesignName,
							this.reportDocumentName, this.moduleOptions );
			if ( reportDocumentInstance != null )
			{
				reportRunnable = reportDocumentInstance.getReportRunnable( );
			}
			
			if ( reportRunnable == null )
			{
				
				if ( !ParameterAccessor
						.isValidFilePath( ParameterAccessor.getParameter(
								request, ParameterAccessor.PARAM_REPORT ) ) )
				{
					throw new ViewerException(
							ResourceConstants.GENERAL_EXCEPTION_REPORT_ACCESS_ERROR,
							new String[]{this.reportDesignName} );
				}
				try
				{
					
					reportRunnable = BirtUtility.getRunnableFromDesignFile(
							request, this.reportDesignName, this.moduleOptions );
					if ( reportRunnable == null )
					{