Added handling for when the channel's deleted when the bot's down

Author: Taaku18

bot.py

@@ -204,18 +204,26 @@ async def on_ready(self):
             await self.threads.populate_cache()
         await self.config.update()
 
-        closures = self.config.get('closures', {})
+        closures = self.config.get('closures', {}).copy()
         print(closures)  # for debugging
         for recipient_id, items in closures.items():
             after = (datetime.datetime.fromisoformat(items['time']) -
                      datetime.datetime.utcnow()).total_seconds()
             if after < 0:
                 after = 0
             recipient = self.get_user(int(recipient_id))
-            print(recipient)
+
             thread = await self.threads.find(
                 recipient=recipient)
-            print(thread)
+
+            if not thread:
+                # If the recipient is gone or channel is deleted
+                closures = self.config.get('closures', {})
+                closures.pop(str(recipient_id))
+                self.config['closures'] = closures
+                await self.config.update()
+                continue
+
             # TODO: Retrieve messages/replies when bot is down, from history?
             await thread.close(closer=self.get_user(items['closer_id']),
                                after=after,