Fixed scheduler-related issues

classes/pycordbot.py

@@ -14,6 +14,9 @@ class PycordBot(LibPycordBot):
 
         self.client_session = ClientSession()
 
+        if self.scheduler is None:
+            return
+
         # Scheduler job for DHL parcel tracking
         self.scheduler.add_job(
             update_tracks_dhl,
@@ -40,6 +43,8 @@ class PycordBot(LibPycordBot):
 
     async def close(self, *args: Any, **kwargs: Any) -> None:
         await self.client_session.close()
+
+        if self.scheduler is not None:
             self.scheduler.shutdown()
 
         await super().close(*args, **kwargs)