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get_env_list raises TypeError in offline mode

See original GitHub issue

Bug Description If call get_env_list() in offline mode, it raises TypeError.

Reproduction Steps

>>> import visdom
>>> vis = visdom.Visdom(offline=True, log_to_filename="/tmp/log.visdom")
>>> vis.get_env_list()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/conda/lib/python3.7/site-packages/visdom/__init__.py", line 822, in get_env_list
    return json.loads(self._send({}, endpoint='env_state', quiet=True))
  File "/opt/conda/lib/python3.7/json/__init__.py", line 341, in loads
    raise TypeError(f'the JSON object must be str, bytes or bytearray, '
TypeError: the JSON object must be str, bytes or bytearray, not bool