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
reportDocumentInstance = ReportEngineService.getInstance( )
						.openReportDocument( this.reportDesignName,
								this.reportDocumentName, this.moduleOptions );
				if ( reportDocumentInstance != null )
				{
					reportRunnable = reportDocumentInstance.getReportRunnable( );
				}
				else
				{
					throw new ViewerException(
							ResourceConstants.GENERAL_EXCEPTION_DOCUMENT_FILE_ERROR,
							new String[]{this.reportDocumentName} );
				}
			}
			else
			{
				throw new ViewerException(
						ResourceConstants.GENERAL_EXCEPTION_DOCUMENT_ACCESS_ERROR,
						new String[]{this.reportDocumentName} );
			}
		}
		else if ( isReportExist )
		{
			if ( isDocumentExist
					&& !ParameterAccessor.isValidFilePath( ParameterAccessor
							.getParameter( request,
									ParameterAccessor.PARAM_REPORT_DOCUMENT ) ) )
			{
				throw new ViewerException(