Script throws and crashes if Mastodon is unavailable

[ara4n]

Seems that a timed out connection to Mastodon kills the whole script with a Failed to establish a new connection: [Errno 110] Connection timed out. On restarting, any tweets/toots that happened during the downtime are lost...

Traceback (most recent call last):
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connection.py", line 141, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/util/connection.py", line 83, in create_connection
    raise err
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/util/connection.py", line 73, in create_connection
    sock.connect(sa)
TimeoutError: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 345, in _make_request
    self._validate_conn(conn)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 844, in _validate_conn
    conn.connect()
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connection.py", line 284, in connect
    conn = self._new_conn()
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connection.py", line 150, in _new_conn
    self, "Failed to establish a new connection: %s" % e)
requests.packages.urllib3.exceptions.NewConnectionError: <requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f74aedbf400>: Failed to establish a new connection: [Errno 110] Connection timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 649, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/packages/urllib3/util/retry.py", line 376, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
requests.packages.urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='mastodon.matrix.org', port=443): Max retries exceeded with url: /api/v1/accounts/73/statuses (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object
 at 0x7f74aedbf400>: Failed to establish a new connection: [Errno 110] Connection timed out',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/mastodon/Mastodon.py", line 812, in __api_request
    response_object = requests.get(self.api_base_url + endpoint, data = params, headers = headers, files = files, timeout = self.request_timeout)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/api.py", line 70, in get
    return request('get', url, params=params, **kwargs)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/api.py", line 56, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/requests/adapters.py", line 487, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='mastodon.matrix.org', port=443): Max retries exceeded with url: /api/v1/accounts/73/statuses (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f74aedbf
400>: Failed to establish a new connection: [Errno 110] Connection timed out',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./MastodonToTwitter.py", line 243, in <module>
    new_toots = mastodon_api.account_statuses(ma_account_id, since_id = since_toot_id)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/mastodon/Mastodon.py", line 363, in account_statuses
    return self.__api_request('GET', '/api/v1/accounts/' + str(id) + '/statuses', params)
  File "/home/mastodon/MastodonToTwitter/env/lib/python3.4/site-packages/mastodon/Mastodon.py", line 823, in __api_request
    raise MastodonNetworkError("Could not complete request: %s" % e)
mastodon.Mastodon.MastodonNetworkError: Could not complete request: HTTPSConnectionPool(host='mastodon.matrix.org', port=443): Max retries exceeded with url: /api/v1/accounts/73/statuses (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f74aedbf400>: Failed to establish a new connection: [Errno 110] Connection timed out',))