Exceptions from Praw comments stream crashes bot

[AlexBurkey]

Describe the bug
Currently using Praw's reddit comments stream to monitor comments in the subreddit. When there is an issue with the stream or reddit like a 503 error the program just raises the exception and drops out

To Reproduce
Take reddit down I guess? I'm not interested in mocking a reddit client.

Expected behavior
The bot should be able to deal with reddit being down just like it deals with issues with making requests to Imgur.

Additional context
nohup.out log:

Setting up DB...
Done!
Looking for comments...
Traceback (most recent call last):
  File "bot.py", line 250, in <module>
    for comment in r.subreddit(SUBREDDIT_NAME).stream.comments():
  File "/home/pi/.local/lib/python3.7/site-packages/praw/models/util.py", line 186, in stream_generator
    for item in reversed(list(function(limit=limit, **function_kwargs))):
  File "/home/pi/.local/lib/python3.7/site-packages/praw/models/listing/generator.py", line 61, in __next__
    self._next_batch()
  File "/home/pi/.local/lib/python3.7/site-packages/praw/models/listing/generator.py", line 71, in _next_batch
    self._listing = self._reddit.get(self.url, params=self.params)
  File "/home/pi/.local/lib/python3.7/site-packages/praw/reddit.py", line 490, in get
    return self._objectify_request(method="GET", params=params, path=path)
  File "/home/pi/.local/lib/python3.7/site-packages/praw/reddit.py", line 574, in _objectify_request
    data=data, files=files, method=method, params=params, path=path
  File "/home/pi/.local/lib/python3.7/site-packages/praw/reddit.py", line 732, in request
    timeout=self.config.timeout,
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/sessions.py", line 336, in request
    url=url,
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/sessions.py", line 235, in _request_with_retries
    url,
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/sessions.py", line 195, in _make_request
    timeout=timeout,
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/rate_limit.py", line 35, in call
    kwargs["headers"] = set_header_callback()
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/sessions.py", line 282, in _set_header_callback
    self._authorizer.refresh()
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/auth.py", line 352, in refresh
    password=self._password,
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/auth.py", line 149, in _request_token
    response = self._authenticator._post(url, **data)
  File "/home/pi/.local/lib/python3.7/site-packages/prawcore/auth.py", line 32, in _post
    raise ResponseException(response)
prawcore.exceptions.ResponseException: received 503 HTTP response
[Sun 24 May 14:47:38 BST 2020] bot exited with code 1. restarting ...