Yanqin Jin e1aa8c160f Fix an error while running db_crashtest for non-user-ts tests (#8091)
Summary:
Fix the following error while running `make crash_test`
```
Traceback (most recent call last):
  File "tools/db_crashtest.py", line 705, in <module>
    main()
  File "tools/db_crashtest.py", line 696, in main
    blackbox_crash_main(args, unknown_args)
  File "tools/db_crashtest.py", line 479, in blackbox_crash_main
    + list({'db': dbname}.items())), unknown_args)
  File "tools/db_crashtest.py", line 414, in gen_cmd
    finalzied_params = finalize_and_sanitize(params)
  File "tools/db_crashtest.py", line 331, in finalize_and_sanitize
    dest_params.get("user_timestamp_size") > 0):
TypeError: '>' not supported between instances of 'NoneType' and 'int'
```

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8091

Test Plan: make crash_test

Reviewed By: ltamasi

Differential Revision: D27268276

Pulled By: riversand963

fbshipit-source-id: ed2873b9587ecc51e24abc35ef2bd3d91fb1ed1b
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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/ and https://rocksdb.slack.com/

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.

Description
A library that provides an embeddable, persistent key-value store for fast storage.
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