Fixed the errors from my last PRs

I testet all using pytest and python versions 3.6-3.9 on macOS

telebot/__init__.py

@@ -9,6 +9,9 @@ import time
 import traceback
 from typing import List, Union
 
+import telebot.util
+import telebot.types
+
 logger = logging.getLogger('TeleBot')
 formatter = logging.Formatter(
     '%(asctime)s (%(filename)s:%(lineno)d %(threadName)s) %(levelname)s - %(name)s: "%(message)s"'

telebot/types.py

@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 import logging
-import types
 from typing import Dict, List
 
 try:
@@ -159,6 +158,7 @@ class User(JsonDeserializable, Dictionaryable, JsonSerializable):
     def de_json(cls, json_string):
         if (json_string is None): return None
         obj = cls.check_json(json_string)
+        print (obj)
         return cls(**obj)
 
     def __init__(self, id, is_bot, first_name, last_name=None, username=None, language_code=None, 
@@ -626,6 +626,8 @@ class Audio(JsonDeserializable):
         obj = cls.check_json(json_string)
         if 'thumb' in obj and 'file_id' in obj['thumb']:
             obj['thumb'] = PhotoSize.de_json(obj['thumb'])
+        else: 
+            obj['thumb'] = None
         return cls(**obj)
 
     def __init__(self, file_id, file_unique_id, duration, performer=None, title=None, file_name=None, mime_type=None, 
@@ -663,6 +665,8 @@ class Document(JsonDeserializable):
         obj = cls.check_json(json_string)
         if 'thumb' in obj and 'file_id' in obj['thumb']:
             obj['thumb'] = PhotoSize.de_json(obj['thumb'])
+        else: 
+            obj['thumb'] = None
         return cls(**obj)
 
     def __init__(self, file_id, file_unique_id, thumb=None, file_name=None, mime_type=None, file_size=None, **kwargs):
@@ -2221,6 +2225,8 @@ class StickerSet(JsonDeserializable):
         obj['stickers'] = stickers
         if 'thumb' in obj and 'file_id' in obj['thumb']:
             obj['thumb'] = PhotoSize.de_json(obj['thumb'])
+        else:
+            obj['thumb'] = None
         return cls(**obj)
 
     def __init__(self, name, title, is_animated, contains_masks, stickers, thumb=None, **kwargs):
@@ -2239,6 +2245,8 @@ class Sticker(JsonDeserializable):
         obj = cls.check_json(json_string)
         if 'thumb' in obj and 'file_id' in obj['thumb']:
             obj['thumb'] = PhotoSize.de_json(obj['thumb'])
+        else:
+            obj['thumb'] = None
         if 'mask_position' in obj:
             obj['mask_position'] = MaskPosition.de_json(obj['mask_position'])
         return cls(**obj)
@@ -2424,6 +2432,7 @@ class Poll(JsonDeserializable):
     def de_json(cls, json_string):
         if (json_string is None): return None
         obj = cls.check_json(json_string)
+        obj['poll_id'] = obj.pop('id')
         options = []
         for opt in obj['options']:
             options.append(PollOption.de_json(opt))
@@ -2465,6 +2474,7 @@ class PollAnswer(JsonSerializable, JsonDeserializable, Dictionaryable):
         if (json_string is None): return None
         obj = cls.check_json(json_string)
         obj['user'] = User.de_json(obj['user'])
+        obj['options_ids'] = obj.pop('option_ids')
         return cls(**obj)
 
     def __init__(self, poll_id, user, options_ids, **kwargs):

telebot/util.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-# credits: https://adamj.eu/tech/2021/05/13/python-type-hints-how-to-fix-circular-imports/
-from __future__ import annotations
 import random
 import re
 import string
@@ -8,12 +6,11 @@ import threading
 import traceback
 import warnings
 import functools
-from typing import Any, List, Dict, TYPE_CHECKING
+from typing import Any, List, Dict
 
 import queue as Queue
 import logging
-# credits: https://adamj.eu/tech/2021/05/13/python-type-hints-how-to-fix-circular-imports/
-if TYPE_CHECKING:
+
 from telebot import types
 
 try:
@@ -198,7 +195,7 @@ def is_command(text: str) -> bool:
     :param text: Text to check.
     :return: True if `text` is a command, else False.
     """
-    if (text is None): return None
+    if (text is None): return False
     return text.startswith('/')