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jsondecodeerror if pipfile.lock does not exist

See original GitHub issue

seems like a recent regression

$ pipenv install
Pipfile.lock not found, creating…
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Traceback (most recent call last):
  File "/Users/johria/.pyenv/versions/3.6.2/bin/pipenv", line 11, in <module>
    load_entry_point('pipenv==8.0.8', 'console_scripts', 'pipenv')()
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/cli.py", line 1732, in install
    do_init(dev=dev, allow_global=system, ignore_pipfile=ignore_pipfile, system=system, skip_lock=skip_lock, verbose=verbose, concurrent=concurrent, deploy=deploy)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/cli.py", line 1244, in do_init
    do_lock(system=system)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/site-packages/pipenv/cli.py", line 1110, in do_lock
    lockfile['_meta']['host-environment-markers'] = simplejson.loads(c.out)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/json/__init__.py", line 354, in loads
    return _default_decoder.decode(s)
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/johria/.pyenv/versions/3.6.2/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)