Fix the bloom filter skipping empty prefixes
Summary: bc0da4b5 optimized bloom filters by skipping duplicate entires when the whole key and prefixes are both added to the bloom. It however used empty string as the initial value of the last entry added to the bloom. This is incorrect since empty key/prefix are valid entires by themselves. This patch fixes that. Closes https://github.com/facebook/rocksdb/pull/3776 Differential Revision: D7778803 Pulled By: maysamyabandeh fbshipit-source-id: d5a065daebee17f9403cac51e9d5626aac87bfbc
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