OO-2537: check evaluation (implement evaluation in project broker for the status)

src/main/java/org/olat/course/nodes/ProjectBrokerCourseNode.java

@@ -469,12 +469,12 @@ public class ProjectBrokerCourseNode extends GenericCourseNode implements Persis
 
 	@Override
 	public AssessmentEvaluation getUserScoreEvaluation(UserCourseEnvironment userCourseEnv) {
-		return null;
+		return getUserScoreEvaluation(getUserAssessmentEntry(userCourseEnv));
 	}
 
 	@Override
 	public AssessmentEvaluation getUserScoreEvaluation(AssessmentEntry entry) {
-		return null;
+		return AssessmentEvaluation.toAssessmentEvalutation(entry, this);
 	}
 
 	@Override

src/main/java/org/olat/course/nodes/ta/DropboxScoringViewController.java

@@ -334,6 +334,9 @@ public class DropboxScoringViewController extends BasicController {
 				if(node instanceof AssessableCourseNode) {
 					AssessableCourseNode acn = (AssessableCourseNode)node;
 					AssessmentEvaluation eval = acn.getUserScoreEvaluation(userCourseEnv);
+					if (eval == null) {
+						eval = AssessmentEvaluation.EMPTY_EVAL;
+					}
 					if(eval.getAssessmentStatus() == null || eval.getAssessmentStatus() == AssessmentEntryStatus.notStarted) {
 						eval = new AssessmentEvaluation(eval, AssessmentEntryStatus.inProgress);
 						acn.updateUserScoreEvaluation(eval, userCourseEnv, getIdentity(), false);