Exit when channels isn't defined

bot.py

@@ -79,6 +79,7 @@ async def main():
             exit(1)
         elif not config[section]['channels']:
             print(f"ERROR: You didn't define any channels in section {section}.")
+            exit(1)
         server = config[section]['server']
         nickname = config[section]['nickname']
         channels = set(config[section]['channels'].split(' '))