sdong 27ec3b3466 Sanitize input in DB::MultiGet() API (#6054)
Summary:
The new DB::MultiGet() doesn't validate input for num_keys > 1 and GCC-9 complains about it. Fix it by directly return when num_keys == 0
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6054

Test Plan: Build with GCC-9 and see it passes.

Differential Revision: D18608958

fbshipit-source-id: 1c279aff3c7fe6e9d5a6d085ed02550ecea4fdb2
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