Fixed sending message to user without an event channel

classes/pycord_bot.py

@@ -145,6 +145,14 @@ class PycordBot(LibPycordBot):
             users: List[PycordUser] = await self._get_event_participants(event._id)
 
             for user in users:
+                if str(event._id) not in user.event_channels:
+                    logger.warning(
+                        "User %s participated in the event %s but did not have a channel. End message will not be sent and permissions will not be updated.",
+                        user.id,
+                        event._id,
+                    )
+                    continue
+
                 # Send a notification about event start
                 user_channel: TextChannel = guild.get_channel(user.event_channels[str(event._id)])