Titles plot fails for some image dimensions

[mkdryden]

Apparently /stats titles fails for chats with a small number of titles, resulting in a weird shaped image:

telegram-stats-bot_1  | Traceback (most recent call last):
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/ext/utils/promise.py", line 96, in run
telegram-stats-bot_1  |     self._result = self.pooled_function(*self.args, **self.kwargs)
telegram-stats-bot_1  |   File "/usr/src/app/telegram_stats_bot/main.py", line 173, in print_stats
telegram-stats-bot_1  |     context.bot.send_photo(chat_id=update.effective_chat.id, photo=image)
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/bot.py", line 134, in decorator
telegram-stats-bot_1  |     result = func(*args, **kwargs)
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/bot.py", line 753, in send_photo
telegram-stats-bot_1  |     return self._message(  # type: ignore[return-value]
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/ext/extbot.py", line 203, in _message
telegram-stats-bot_1  |     result = super()._message(
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/bot.py", line 344, in _message
telegram-stats-bot_1  |     result = self._post(endpoint, data, timeout=timeout, api_kwargs=api_kwargs)
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/bot.py", line 299, in _post
telegram-stats-bot_1  |     return self.request.post(
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/utils/request.py", line 359, in post
telegram-stats-bot_1  |     result = self._request_wrapper('POST', url, fields=data, **urlopen_kwargs)
telegram-stats-bot_1  |   File "/usr/local/lib/python3.9/site-packages/telegram/utils/request.py", line 279, in _request_wrapper
telegram-stats-bot_1  |     raise BadRequest(message)
telegram-stats-bot_1  | telegram.error.BadRequest: Photo_invalid_dimensions