The disconnect() method was unconditionally calling updater.stop() and
app.stop(), causing errors when:
- The updater was not running (RuntimeError: This Updater is not running!)
- The app was None (AttributeError: 'NoneType' object has no attribute)
Changes:
- Check if updater exists and is running before stopping
- Check if app is running before stopping
- Only log warnings for actual errors, not expected shutdown states
Fixes spurious warnings during gateway shutdown.
0c182211a1