Oleksandr Pryimak 986fee6022 pytest tests/python fails if no pandas installed (#4620)
* _maybe_pandas_xxx should return their arguments unchanged if no pandas installed

* Tests should not assume pandas is installed

* Mark tests which require pandas as such
2019-07-01 02:54:08 +08:00
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2018-11-15 13:56:33 +13:00
2019-05-27 13:29:28 +12:00