Reduce empty SST creation/deletion during compaction (#4311)
Summary: I have a PR to start calling `OnTableFileCreated` for empty SSTs: #4307. However, it is a behavior change so should not go into a patch release. This PR adds back a check to make sure range deletions at least exist before starting file creation. This PR should be safe to backport to earlier versions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4311 Differential Revision: D9493734 Pulled By: ajkr fbshipit-source-id: f0d43cda4cfd904f133cfe3a6eb622f52a9ccbe8
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