OO-5048: harden course and correction workflow against corrupted item

src/main/java/org/olat/ims/qti21/model/QTI21QuestionType.java

@@ -117,6 +117,8 @@ public enum QTI21QuestionType {
 	}
 	
 	public static QTI21QuestionType getTypeRelax(AssessmentItem item) {
+		if(item == null) return QTI21QuestionType.unkown;
+		
 		//we have create this one
 		List<Interaction> interactions = item.getItemBody().findInteractions();
 		

src/main/java/org/olat/ims/qti21/model/xml/QtiMaxScoreEstimator.java

@@ -73,7 +73,7 @@ public class QtiMaxScoreEstimator {
 		} else if(sectionPart instanceof AssessmentItemRef) {
 			AssessmentItemRef itemRef = (AssessmentItemRef)sectionPart;
 			ResolvedAssessmentItem resolvedAssessmentItem = resolvedAssessmentTest.getResolvedAssessmentItem(itemRef);
-			AssessmentItem assessmentItem = resolvedAssessmentItem.getRootNodeLookup().extractAssumingSuccessful();
+			AssessmentItem assessmentItem = resolvedAssessmentItem.getRootNodeLookup().extractIfSuccessful();
 			if(assessmentItem != null) {
 				Double maxScore = QtiNodesExtractor.extractMaxScore(assessmentItem);
 				visitor.add(maxScore);

src/main/java/org/olat/ims/qti21/ui/assessment/model/CorrectionAssessmentItemRow.java

@@ -62,7 +62,7 @@ public class CorrectionAssessmentItemRow extends CorrectionRow {
 	}
 	
 	public String getItemTitle() {
-		return item.getTitle();
+		return item == null ? "ERROR" : item.getTitle();
 	}
 	
 	public QTI21QuestionType getItemType() {

src/main/java/org/olat/ims/qti21/ui/editor/_i18n/LocalStrings_de.properties

@@ -253,6 +253,7 @@ new.sc=Single Choice
 new.section=Sektion
 new.spots=Spots hinzuf\u00FCgen
 new.testpart=Test-Part
+new.unkown=Unbekannt
 new.upload=Datei hochladen
 passed.cut.value=Automatisch durch Punkteschwelle
 passed.enabled=Bestanden / Nicht bestanden ausgegeben

src/main/java/org/olat/ims/qti21/ui/editor/_i18n/LocalStrings_en.properties

@@ -253,6 +253,7 @@ new.sc=Single choice
 new.section=Section
 new.spots=Add spots
 new.testpart=Test part
+new.unkown=Unknown
 new.upload=Upload file
 passed.cut.value=Using cut value
 passed.enabled=Display passed / failed

src/main/java/org/olat/ims/qti21/ui/editor/_i18n/LocalStrings_fr.properties

@@ -254,6 +254,7 @@ new.sc=Choix simple
 new.section=Section
 new.spots=Ajouter un emplacement
 new.testpart=Partie de test
+new.unkown=Inconnu
 new.upload=T\u00E9l\u00E9verser un fichier
 passed.cut.value=Automatique par score \u00E0 obtenir
 passed.enabled=Afficher r\u00E9ussi / pas r\u00E9ussi