Christos Soulios 43dab77186
[7.x] Modified searchAndReduce() to return empty agg when no docs exist (#55967)
Backports #55826 to 7.x

    Modified AggregatorTestCase.searchAndReduce() method so that it returns an empty aggregation result when no documents have been inserted.

    Also refactored several aggregation tests so they do not re-implement method AggregatorTestCase.testCase()

    Fixes #55824
2020-04-30 00:28:32 +03:00
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