RS if the cached groups in course environment is null

2014-06-10 22:23:54,140 [ajp-apr-8026-exec-4] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N26-E1
Mozilla/5.0 (iPad; CPU OS 7_1_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D201 Safari/9537.53
**RedScreen**
<dispatchinfo>
	<componentinfo>
		<compname>segments</compname>
		<compclass>org.olat.core.gui.components.segmentedview.SegmentViewComponent</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.components.segmentedview.SegmentViewEvent</class&gt;
			<command>seg-view-selection</command>
			<tostring>com:seg-view-selection,org.olat.core.gui.components.segmentedview.SegmentViewEvent@67ce60fb</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.course.nodes.cl.ui.CheckListRunForCoachController</controllername>
		<controllername>org.olat.course.run.preview.PreviewRunController</controllername>
		<controllername>org.olat.course.run.preview.PreviewConfigController</controllername>
		<controllername>org.olat.course.editor.EditorMainController</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.controller.simple.SimpleBaseController</controllername>
		<controllername>org.olat.core.commons.chiefcontrollers.BaseChiefController</controllername>
	</controllerinfo>
</dispatchinfo>
>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:115)
   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:516)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:228)
   at org.olat.core.gui.components.Component.dispatchRequest(Component.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:268)
   at org.olat.core.servlets.OpenOLATServlet.doGet(OpenOLATServlet.java:197)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.course.nodes.cl.ui.CheckListAssessmentController.initForm(CheckListAssessmentController.java:243)
   at org.olat.core.gui.components.form.flexible.impl.FormBasicController.initForm(FormBasicController.java:215)
   at org.olat.course.nodes.cl.ui.CheckListAssessmentController.<init>(CheckListAssessmentController.java:181)
   at org.olat.course.nodes.cl.ui.CheckListRunForCoachController.doOpenCoach(CheckListRunForCoachController.java:109)
   at org.olat.course.nodes.cl.ui.CheckListRunForCoachController.event(CheckListRunForCoachController.java:93)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:195)
   at org.olat.core.gui.components.Component$1.run(Component.java:238)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.Component.fireEvent(Component.java:236)
   at org.olat.core.gui.components.segmentedview.SegmentViewComponent.doDispatchRequest(SegmentViewComponent.java:156)
   at org.olat.core.gui.components.Component.dispatchRequest(Component.java:192)