fix nextchapter function empty

Html/apps/function_tools/chapter.py

@@ -0,0 +1,7 @@
+from flask import current_app
+
+def next_chapter(user_uuid):
+    ex = current_app.extensions
+    user_uuid2chatmanager = ex["user_uuid2chatmanager"]
+    user_uuid2chatmanager[user_uuid].next_chapter()
+    return "成功进入下一章"