Steps to reproduce

1. Create an operation with the above mentioned aspects

Ex:

def run_bot(token):    def make_pasta(update, context):        msg = update.message        if msg.reply_to_message is None:            msg.reply_text(responses.NOT_A_REPLY)            return        if msg.reply_to_message.document is None:            msg.reply_text(responses.NOT_A_DOC)            return        telegram_file = File(msg.reply_to_message.document.file_id)        telegram_file.download()     updater = Updater(token, use_context=True)    dp = updater.dispatcher    dp.add_handler(CommandHandler('hello', hello))    dp.add_handler(CommandHandler('make_pasta', make_pasta))    print('Log: Seu bot iniciou! (:')    updater.start_polling()    updater.idle()

(I know this is not exactly a MWE, sorry)

Expected behaviour

According to the documentation, it should download the file directly to my current working directoryDownload this file. By default, the file is saved in the current working directory with its original filename as reported by Telegram.

Actual behaviour

ontelegram/files/file.py, on the download function, we get a type error sinceself.file_path is NoneType, not str or os.PathLike object

Configuration

Ubuntu 18.04

python-telegram-bot 12.2.0
certifi 2019.09.11
future 0.18.1
Python 3.7.3 (default, Apr 3 2019, 19:16:38) [GCC 8.0.1 20180414 (experimental) [trunk revision 259383]]