Fix re-use of indexes and refresh method on null attributes#807

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jhh3000 wants to merge 3 commits intopynamodb:masterfrom jhh3000:fix_indexes_and_refresh

+11-14

Commits on Jun 29, 2020

fix bug for reusing indexes
jhh3000
committed
fix bug for calling .refresh() on an object that has a null value stored in python object but is not null in the db
jhh3000
committed

Commits on Jul 1, 2020

fix count as well
jhh3000
committed