fix: alle studenten hoeven niet in een groep bij drag en drop + opdracht deadline mag null zijn

backend/src/interfaces/assignment.ts

@@ -20,7 +20,7 @@ export function mapToAssignmentDTO(assignment: Assignment): AssignmentDTO {
         description: assignment.description,
         learningPath: assignment.learningPathHruid,
         language: assignment.learningPathLanguage,
-        deadline: assignment.deadline ?? new Date(),
+        deadline: assignment.deadline ?? null,
         groups: assignment.groups.map((group) => mapToGroupDTO(group, assignment.within)),
     };
 }

frontend/src/components/assignments/GroupSelector.vue

@@ -562,7 +562,6 @@
                     <v-btn
                         color="primary"
                         @click="saveDragDrop"
-                        :disabled="unassignedStudents.length > 0"
                     >
                         {{ t("save") }}
                     </v-btn>