fixed missed eid

data/1.Java初阶/7.集合/9.散列集/hashset.json

@@ -2,6 +2,6 @@
   "type": "code_options",
   "author": "lostrex",
   "source": "hashset.md",
-  "exercise_id": "",
+  "exercise_id": "e5f555e0fd71468d8879035889e7fec6",
   "notebook_enable": false
 }
\ No newline at end of file

src/tree.py

@@ -327,7 +327,7 @@ class TreeWalker:
         for e in config.get("export", []):
             full_name = os.path.join(section_path, e)
             exercise = load_json(full_name)
-            if "exercise_id" not in exercise or exercise.get("exercise_id") in id_set:
+            if not exercise.get("exercise_id") or exercise.get("exercise_id") in id_set:
                 eid = uuid.uuid4().hex
                 exercise["exercise_id"] = eid
                 dump_json(full_name, exercise, True, True)