OO-2290: if the test cannot be found, show a message instead of a red screen

src/main/java/org/olat/modules/iq/IQManager.java

@@ -123,10 +123,16 @@ public class IQManager implements UserDataDeletable {
 		// -- VERY RARE CASE -- 1) qti is open in an editor session right now on the screen (or session on the way to timeout)
 		// -- 99% of cases   -- 2) qti is ready to be run as test/survey
 		String repositorySoftkey = (String) moduleConfiguration.get(IQEditController.CONFIG_KEY_REPOSITORY_SOFTKEY);
-		RepositoryEntry re = RepositoryManager.getInstance().lookupRepositoryEntryBySoftkey(repositorySoftkey, true);
-		if (CoordinatorManager.getInstance().getCoordinator().getLocker().isLocked(re.getOlatResource(), null)){
+		RepositoryEntry re = RepositoryManager.getInstance().lookupRepositoryEntryBySoftkey(repositorySoftkey, false);
+		if(re == null) {
+			log.error("The test repository entry with this soft key could not be found: " + repositorySoftkey);
 			Translator translator = Util.createPackageTranslator(this.getClass(), ureq.getLocale());
-      //so this resource is locked, let's find out who locked it
+			String title = translator.translate("error.test.deleted.title");
+			String msg = translator.translate("error.test.deleted.msg");
+			return MessageUIFactory.createInfoMessage(ureq, wControl, title, msg);
+		} else if (CoordinatorManager.getInstance().getCoordinator().getLocker().isLocked(re.getOlatResource(), null)){
+			Translator translator = Util.createPackageTranslator(this.getClass(), ureq.getLocale());
+			//so this resource is locked, let's find out who locked it
 			LockResult lockResult = CoordinatorManager.getInstance().getCoordinator().getLocker().acquireLock(re.getOlatResource(), ureq.getIdentity(), null);
 			String fullName = userManager.getUserDisplayName(lockResult.getOwner());
 			return MessageUIFactory.createInfoMessage(ureq, wControl, translator.translate("status.currently.locked.title"), 

src/main/java/org/olat/modules/iq/_i18n/LocalStrings_de.properties

@@ -23,6 +23,8 @@ confirmCancel=Wollen Sie wirklich abbrechen? Es werden keine Daten gespeichert\!
 confirmSubmit=Wollen Sie wirklich abschliessen?
 confirmSuspend=Wollen Sie wirklich unterbrechen?
 couldNotDisplayItem=Die Frage ist geschlossen und kann daher nicht mehr angezeigt werden.
+error.test.deleted.title=Fehlende Test
+error.test.deleted.msg=Der Test wurde gel\u00F6scht oder konnte nicht gefunden werden.
 itemclosed=Frage geschlossen
 noMaxScore=Kein Maximum
 question=Frage

src/main/java/org/olat/modules/iq/_i18n/LocalStrings_en.properties

@@ -24,6 +24,8 @@ confirmCancel=Do you really want to cancel? No data will be saved\!
 confirmSubmit=Do you really want to submit?
 confirmSuspend=Do you really want to suspend?
 couldNotDisplayItem=This question is closed and can therefore not be displayed anymore.
+error.test.deleted.title=Missing Test
+error.test.deleted.msg=The Testwas deleted or it cannot be found.
 itemclosed=Question closed
 noMaxScore=No maximum
 qti.marker.title={0} solution attempt(s), not marked