IsEmpty() checks were missing before some SwitchMemtable() invocation…

[pranavshenoy]

Bug: https://github.com/facebook/rocksdb/issues/12179

There was one instance where the IsEmpty() check was missing:

rocksdb/db/db_impl/db_impl_write.cc

Line 1706 in 21d5a8f

status = SwitchMemtable(cfd, write_context); Having one check inside SwitchMemTable() will ensure there won't be misses in the future.

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