BUG: GroupBy.count() and GroupBy.sum() incorreclty return NaN instead of 0 for missing categories#35201

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smithto1:issue31422

Commits on Jul 8, 2020

#35028 DFGroupBy.count() now returns zero for missing categories when groupby by multiple categories
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#31422 GroupBy.sum() returns 0 for missing categories when grouping by multiple Categoricals. Updates to tests to reflect this expected output
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Commits on Jul 9, 2020