don't crash when drop_writes is enabled and the databases are not empty: a NULL ptr was being cast to a ref in dbfe::insert
don't crash when drop_writes is enabled and the databases are not empty: a NULL ptr was being cast to a ref in dbfe::insert

weidezhang/dht,sit/dht,sit/dht,weidezhang/dht,weidezhang/dht,sit/dht,weidezhang/dht,sit/dht,sit/dht,weidezhang/dht