Compaction with zero outputs
Summary: We had a hypothesis in https://reviews.facebook.net/D18507 that empty-string internal keys might have been caused by compaction filter deleting all the entries. I added a unit test for that case. Unforutnately, everything works as expected. Test Plan: this is a test Reviewers: dhruba, haobo, sdong Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D18519
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