Support null answer to callback queries

davtelepot/__init__.py

@@ -7,7 +7,7 @@ __author__ = "Davide Testa"
 __email__ = "davide@davte.it"
 __credits__ = ["Marco Origlia", "Nick Lee @Nickoala"]
 __license__ = "GNU General Public License v3.0"
-__version__ = "2.0.8"
+__version__ = "2.0.9"
 __maintainer__ = "Davide Testa"
 __contact__ = "t.me/davte"
 

davtelepot/bot.py

@@ -541,6 +541,8 @@ class Bot(TelegramBot, ObjectWithDatabase):
                     user_record=user_record
                 )
                 break
+        if type(answer) is None:
+            answer = ''
         if type(answer) is str:
             answer = dict(text=answer)
         assert type(answer) is dict, "Invalid callback query answer."