BUG: Series construction with dtype=JSONDtype() and index but no data RecursionError
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

- [x] (optional) I have confirmed this bug exists on the master branch of pandas.

---
#### Code Sample, a copy-pastable example

```python
>>> import numpy as np
>>> import pandas as pd
>>>
>>> pd.__version__
'1.1.0.dev0+1436.g6016b9841'
>>>
>>> from pandas.tests.extension.json.array import JSONDtype
>>>
>>> pd.Series(index=[1, 2, 3], dtype=JSONDtype())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\simon\pandas\pandas\core\series.py", line 283, in __init__
    data, index = self._init_dict(data, index, dtype)
  File "C:\Users\simon\pandas\pandas\core\series.py", line 372, in _init_dict
    s = create_series_with_explicit_dtype(
  File "C:\Users\simon\pandas\pandas\core\construction.py", line 624, in create_series_with_explicit_dtype
    return Series(
  File "C:\Users\simon\pandas\pandas\core\series.py", line 283, in __init__
    data, index = self._init_dict(data, index, dtype)
  File "C:\Users\simon\pandas\pandas\core\series.py", line 372, in _init_dict
    s = create_series_with_explicit_dtype(
  File "C:\Users\simon\pandas\pandas\core\construction.py", line 624, in create_series_with_explicit_dtype
...
RecursionError: maximum recursion depth exceeded in comparison

```

#### Problem description

raises RecursionError

#### Expected Output

1    {}
2    {}
3    {}
dtype: json

#### Output of ``pd.show_versions()``

<details>

[paste the output of ``pd.show_versions()`` here leaving a blank line after the details tag]

</details>
