fixed: 后台数据权限bug

src/main/java/xyz/playedu/api/BCtx.java

@@ -28,9 +28,16 @@ public class BCtx {
     }
 
     private static Object get(String key) {
+        if (THREAD_LOCAL.get() == null) {
+            return null;
+        }
         return THREAD_LOCAL.get().getOrDefault(key, null);
     }
 
+    public static boolean isNull() {
+        return THREAD_LOCAL.get() == null;
+    }
+
     public static void remove() {
         THREAD_LOCAL.remove();
     }