GTA: RS if the documents directory doesn't exists while opening the upload panel

2019-01-07 20:36:01,204 [ajp-nio2-8021-exec-46] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N1-E47 
https://lms.xyz.de/auth/RepositoryEntry/2361327617/CourseNode/86383896706245
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:64.0) Gecko/20100101 Firefox/64.0 ^%^ **RedScreen**
 
 <dispatchinfo>
 	<componentinfo>
 		<compname>luTreeRun</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:98886440369347}</tostring>
 		</event>
 	</componentinfo>
 	<controllerinfo>
 		<controllername>org.olat.course.run.RunMainController</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:589)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:282)
   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:294)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:237)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.course.nodes.gta.ui.SubmitDocumentsController.updateModel(SubmitDocumentsController.java:180)
   at org.olat.course.nodes.gta.ui.SubmitDocumentsController.<init>(SubmitDocumentsController.java:126)
   at org.olat.course.nodes.gta.ui.GTAParticipantController.setSubmitController(GTAParticipantController.java:274)
   at org.olat.course.nodes.gta.ui.GTAParticipantController.stepSubmit(GTAParticipantController.java:249)
   at org.olat.course.nodes.gta.ui.GTAAbstractController.process(GTAAbstractController.java:213)
   at org.olat.course.nodes.gta.ui.GTAParticipantController.<init>(GTAParticipantController.java:106)
   at org.olat.course.nodes.gta.ui.GTARunController.createRun(GTARunController.java:274)
   at org.olat.course.nodes.gta.ui.GTARunController.<init>(GTARunController.java:126)
   at org.olat.course.nodes.GTACourseNode.createNodeRunConstructionResult(GTACourseNode.java:877)
   at org.olat.course.run.navigation.NavigationHandler.doEvaluateJumpTo(NavigationHandler.java:461)
   at org.olat.course.run.navigation.NavigationHandler.evaluateJumpToTreeNode(NavigationHandler.java:286)