[issue41815] SQLite: segfault if backup called on closed database

[Peter McCormick]

Peter McCormick <peter at pdmccormick.com> added the comment:

Updated sample script, thanks to @aeros for catching the omission:

```
import sqlite3
target = sqlite3.connect(':memory:')
source = sqlite3.connect(':memory:')
source.close()
source.backup(target)
```

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41815>
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