Many empty memtables are created during MyRocks create index
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Description
### Expected behavior
New MemTable should not be created if there are empty memtables.
### Actual behavior
Many new (empty) MemTables are created during MyRocks create index. This is a benign bug, these empty MemTables are deleted on create index finishes.
### Steps to reproduce the behavior
In MyRocks, create many indexes in parallel on existing large table while heavily writing to another table.
It seems these MemTables are created in `IngestExternalFiles` -> `FlushMemTable` -> `SwitchMemtable`.
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We found this bug by our webview inspector for DB, gray are empty MemTables:
These empty MemTables get deleted:
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