Fix an unhandled exception caused by network

Signed-off-by: zlaazlaa <2889827787@qq.com>

util/RequestUtil.py

@@ -84,13 +84,23 @@ def get_message_count():
     total = upper_bound // 2  # 初始的总量为上下界的中间值
     with tqdm(desc="正在获取消息列表数量...") as pbar:
         while lower_bound <= upper_bound:
+            try:
                 response = get_message(total, 100)
+
+                if response and hasattr(response, 'text'):
                     if "li" in response.text:
-                # 请求成功，总量应该在当前总量的右侧
                         lower_bound = total + 1
                     else:
-                # 请求失败，总量应该在当前总量的左侧
                         upper_bound = total - 1
-            total = (lower_bound + upper_bound) // 2  # 更新总量为新的中间值
+                else:
+                    print(f"无效的响应对象: {response}")
+                    break
+
+            except Exception as e:
+                print(f"请求发生异常: {e}")
+                break
+
+            total = (lower_bound + upper_bound) // 2
             pbar.update(1)
+
     return total