commits: 255bc8ee9cbe8b212e3262b0d4b2e32088a08064

This data as json

sha	message	author_date	committer_date	raw_author	raw_committer	repo	author	committer
255bc8ee9cbe8b212e3262b0d4b2e32088a08064	docstrings for isnull and notnull (#4618) * add docstrings to isnull and notnull * switch isnull and notnull from monkey patched to true functions * update whats-new.rst * add the missing keep_attrs parameter * add back the variable methods * fix the variable creation	2020-11-30T15:10:56Z	2020-11-30T15:10:56Z	458e78ccf9cedef997b218d835348005d70e25c2	cd792325681cbad9f663f2879d8b69f1edbb678f	13221727	14808389	19864447