completely mitgate the issue

app.py

@@ -139,9 +139,15 @@ async def forum_view():
         if only_use_native_api:
             forum_info, threads = await asyncio.gather(tieba.get_forum_detail(fname),
                                                        tieba.get_threads(fname, pn=pn, sort=sort))
-            forum_info = { 'avatar': 'a6efce1b9d16fdfa6291460ab98f8c5495ee7b51.jpg',
-                           'topic': forum_info.post_num, 'thread': forum_info.post_num,
-                           'member': forum_info.member_num, 'desc': '贴吧描述暂不可用', 'name': forum_info.fname }
+            if hasattr(forum_info, 'slogan'):
+                forum_info = { 'avatar': extract_image_name(forum_info.origin_avatar),
+                               'topic': forum_info.post_num, 'thread': forum_info.post_num,
+                               'member': forum_info.member_num, 'desc': forum_info.slogan,
+                               'name': forum_info.fname }
+            else:
+                forum_info = { 'avatar': 'a6efce1b9d16fdfa6291460ab98f8c5495ee7b51.jpg',
+                               'topic': forum_info.post_num, 'thread': forum_info.post_num,
+                               'member': forum_info.member_num, 'desc': '贴吧描述暂不可用', 'name': forum_info.fname }
         else:
             forum_info, threads = await asyncio.gather(awaitify(find_tieba_info)(fname),
                                                        tieba.get_threads(fname, pn=pn, sort=sort))