RS if download archive of self test made by only a guest

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0 ^%^ **RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>table</compname>
		<compclass>org.olat.core.gui.components.table.Table</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.components.table.TableEvent</class&gt;
			<command>r</command>
			<tostring>cmd:r, rowId:1, actionId:cmd.select.node</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.gui.components.table.TableController</controllername>
		<controllername>org.olat.ims.qti.export.QTIArchiveWizardController</controllername>
		<controllername>org.olat.ims.qti.export.CourseQTIArchiveController</controllername>
		<controllername>org.olat.course.archiver.ArchiverMainController</controllername>
		<controllername>org.olat.course.run.CourseRuntimeController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>>stack of 1.cause::org.olat.core.logging.OLATRuntimeException: Index: 0, Size: 0
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:116)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:57)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:46)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:528)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:233)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:192)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:241)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:197)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:269)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:198)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>>>stack of 2.cause::java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
-> at java.util.ArrayList.rangeCheck(ArrayList.java:638)
   at java.util.ArrayList.get(ArrayList.java:414)
   at org.olat.ims.qti.export.QTIArchiveWizardController.event(QTIArchiveWizardController.java:280)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:245)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:242)
   at org.olat.core.gui.control.DefaultController.fireEvent(DefaultController.java:190)
   at org.olat.core.gui.components.table.TableController.event(TableController.java:321)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:201)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:238)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)