QTI 2.1: a test bound in a course element become unreadable

2017-10-16 18:37:51,161 [ajp-nio2-8009-exec-8] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N1-E57 ^%^ org.olat.core.logging 

https://www.openolat.xyz.de/auth/RepositoryEntry/7012356/Editor/0
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:43.0) Gecko/20100101 Firefox/43.0 SeaMonkey/2.40
**RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>luTree</compname>
		<compclass>org.olat.core.gui.components.tree.MenuTree</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.components.tree.TreeEvent</class&gt;
			<command>ctncl</command>
			<tostring>TreeEvent:{cmd:ctncl, nodeid:96499154541608}</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.course.editor.EditorMainController</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: null
-> 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:549)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:242)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:273)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:190)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:289)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:232)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.ims.qti21.AssessmentTestHelper.needManualCorrection(AssessmentTestHelper.java:110)
   at org.olat.ims.qti21.manager.QTI21ServiceImpl.needManualCorrection(QTI21ServiceImpl.java:377)
   at org.olat.course.nodes.iq.IQConfigurationController.needManualCorrectionQTI21(IQConfigurationController.java:581)
   at org.olat.course.nodes.iq.IQConfigurationController.updateEditController(IQConfigurationController.java:221)
   at org.olat.course.nodes.iq.IQConfigurationController.<init>(IQConfigurationController.java:187)
   at org.olat.course.nodes.iq.IQEditController.init(IQEditController.java:281)
   at org.olat.course.nodes.iq.IQEditController.<init>(IQEditController.java:244)
   at org.olat.course.nodes.IQSELFCourseNode.createEditController(IQSELFCourseNode.java:118)
   at org.olat.course.editor.EditorMainController.initNodeEditor(EditorMainController.java:523)
   at org.olat.course.editor.EditorMainController.updateViewForSelectedNodeId(EditorMainController.java:502)
   at org.olat.course.editor.EditorMainController.event(EditorMainController.java:372)