Fix a map lookup that may throw exception. (#4098)
Summary: `std::map::at(key)` throws std::out_of_range if key does not exist. Current code does not handle this. Although this case is unlikely, I feel it's safe to use `std::map::find`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4098 Differential Revision: D8753865 Pulled By: riversand963 fbshipit-source-id: 9a9ba43badb0fb5e0d24cd87903931fd12f3f8ec
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