[pybsddb] Issue in DBEnv_memp_stat

[Rishin Goswami -X (rishigos - WIPRO LIMITED at Cisco)]

Hello,

I could not find any issue-tracker for the https://pypi.org/project/berkeleydb/ project, so I am communicating about a bug in this mailing list. If there is an issue-tracker, please let me know and I will raise it there.

The issue is in the `DBEnv_memp_stat` function. When calling the `memp_stat`function, we are expecting that the value of `fsp` variable is non NULL. However as per the official documentation, `fsp` can be NULL when "If no individual files currently exist in the cache". For example when `db_env_create` has been done, but we have not yet done a `db_create` followed by a `db->open`. This will cause a NULL pointer reference when looping over `fsp` further down the code and causes a crash.

The following program reproduces the issue -
```
def run():
    # Create env
    env = db.DBEnv(0)
    eflags = db.DB_CREATE | db.DB_INIT_MPOOL
    env.open('/some/path/to/dbenv', flags=eflags)
    # Don't create a db yet
    #x = db.DB(env)
    #x.open('mydb_from_py.db', flags=db.DB_CREATE, dbtype=db.DB_BTREE)
    # memp state
    print(env.memp_stat())
```

Please let me know how this issue will be handled.

Regards,
Rishin Goswami
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