TypeError: Object of type '__proxy__' is not JSON serializable

[mbeacom]

View details in Rollbar: https://rollbar.com/gitcoin/gitcoin/items/709/

Traceback (most recent call last):
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/ubuntu/gitcoin/coin/app/faucet/views.py", line 98, in save_faucet
    new_faucet_request(fr)
  File "/home/ubuntu/gitcoin/coin/app/marketing/mails.py", line 120, in new_faucet_request
    send_mail(from_email, to_email, subject, body, from_name=_("No Reply from Gitcoin.co"))
  File "/home/ubuntu/gitcoin/coin/app/marketing/mails.py", line 76, in send_mail
    response = sg.client.mail.send.post(request_body=mail.get())
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/python_http_client/client.py", line 217, in http_request
    data = json.dumps(kwargs['request_body']).encode('utf-8')
  File "/usr/lib/python3.6/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type '__proxy__' is not JSON serializable