Shifting an empty Series raises a ZeroDivisionError.

[brandtbucher]

Description

Shifting an empty Series raises a ZeroDivisionError.

Example

>>> import static_frame as sf
>>> sf.Series([]).shift(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/bucher/.env38/lib/python3.8/site-packages/static_frame/core/series.py", line 1981, in shift
    values = array_shift(
  File "/home/bucher/.env38/lib/python3.8/site-packages/static_frame/core/util.py", line 1600, in array_shift
    shift_mod = shift % array.shape[axis]
ZeroDivisionError: integer division or modulo by zero

Platform

>>> import static_frame as sf
>>> sf.Platform.display()
<Series: platform>
<Index>
platform           Linux-5.4.0-74-generic-x86_64-with-glibc2.27
sys.version        3.8.3 (default, May 25 2021, 09:38:21) [GCC 7.5.0]
static-frame       0.8.13
numpy              1.17.4
pandas             0.24.2
xlsxwriter         1.1.2
openpyxl           2.5.4
xarray             <ModuleNotFoundError>
tables             3.6.1
pyarrow            0.17.0
msgpack            <ModuleNotFoundError>
msgpack_numpy      <ModuleNotFoundError>
<<U13>             <object>

[flexatone]

Many thanks for isolating this issue. This has been fixed and will be part of the 0.8.14 release.