Made sure to handle the case where the driver object has no irc or its irc is None (like a Scheduler driver or something).

src/drivers.py

@@ -96,6 +96,8 @@ def run():
     for name in _deadDrivers:
         try:
             driver = _drivers[name]
+            if hasattr(driver, 'irc') and driver.irc is not None:
+                # The Schedule driver has no irc object, or it's None.
                 driver.irc.driver = None
             driver.irc = None
             del _drivers[name]