commits: ec6e1603680ffa5a975baf890953cf2605394f0c

This data as json

sha	message	author_date	committer_date	raw_author	raw_committer	repo	author	committer
ec6e1603680ffa5a975baf890953cf2605394f0c	Fix/dask isnull (#1939) * fix isnull for dask arrays and add test to test_duck_array_ops.py * minor cleanup / proper test skipping in test_duck_array_ops.py * whatsnew * Fixing style errors. * flake8	2018-02-25T20:52:16Z	2018-02-25T20:52:16Z	5f199557d0f8f69fbea5e027a407146e2669a812	f10b21bed2846b879806f87039b77245b18e7671	13221727		1217238