Handle errors gracefully

[xlfe]

Traceback (most recent call last):
  File "/root/bb/./pod-xlfe-radiale.py", line 6, in <module>
    asyncio.run(pod.RadialePod().run_pod())
  File "/usr/local/lib/python3.9/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/local/lib/python3.9/asyncio/base_events.py", line 647, in run_until_complete
    return future.result()
  File "/root/bb/radiale/pod.py", line 165, in run_pod
    await asyncio.create_task(            
  File "/root/bb/radiale/esphome.py", line 5, in subscribe_esp
    host, port = opts['addresses'][0]     
IndexError: list index out of range