sympy.Array([]) fails, while sympy.Matrix([]) works

>>> import sympy
KeyboardInterrupt
>>> import sympy
>>> from sympy import Array
>>> sympy.__version__
'1.4'
>>> a = Array([])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/hcui7/miniconda3/envs/a/lib/python3.7/site-packages/sympy/tensor/array/dense_ndim_array.py", line 130, in __new__
    return cls._new(iterable, shape, **kwargs)
  File "/Users/hcui7/miniconda3/envs/a/lib/python3.7/site-packages/sympy/tensor/array/dense_ndim_array.py", line 136, in _new
    shape, flat_list = cls._handle_ndarray_creation_inputs(iterable, shape, **kwargs)
  File "/Users/hcui7/miniconda3/envs/a/lib/python3.7/site-packages/sympy/tensor/array/ndim_array.py", line 142, in _handle_ndarray_creation_inputs
    iterable, shape = cls._scan_iterable_shape(iterable)
  File "/Users/hcui7/miniconda3/envs/a/lib/python3.7/site-packages/sympy/tensor/array/ndim_array.py", line 127, in _scan_iterable_shape
    return f(iterable)
  File "/Users/hcui7/miniconda3/envs/a/lib/python3.7/site-packages/sympy/tensor/array/ndim_array.py", line 120, in f
    elems, shapes = zip(*[f(i) for i in pointer])
ValueError: not enough values to unpack (expected 2, got 0)