OO-3588: fill all cells in the excel export of check lists

src/main/java/org/olat/course/nodes/cl/ui/CheckListAssessmentController.java

@@ -274,7 +274,7 @@ public class CheckListAssessmentController extends FormBasicController implement
 		table.setCustomizeColumns(true);
 		FlexiTableSortOptions sortOptions = new FlexiTableSortOptions();
 		table.setSortSettings(sortOptions);
-		table.setAndLoadPersistedPreferences(ureq, "checklist-assessment");
+		table.setAndLoadPersistedPreferences(ureq, "checklist-assessment-" + courseNode.getIdent());
 		
 		pdfExportButton = uifactory.addFormLink("pdf.export", formLayout, Link.BUTTON);
 		pdfExportButton.setEnabled(numOfCheckbox > 0);

src/main/java/org/olat/course/nodes/cl/ui/CheckListAssessmentDataModel.java

@@ -311,6 +311,8 @@ public class CheckListAssessmentDataModel extends DefaultFlexiTableDataModel<Che
 							Float[] scores = assessmentRow.getScores();
 							if(checked && scores != null && scores.length > 0 && propIndex < scores.length) {
 								dataRow.addCell(pos++, scores[propIndex], null);
+							} else {
+								dataRow.addCell(pos++, null);
 							}
 						}
 					} else {