4ee30c4244
GH- [bpo-41815](): SQLite: fix segfault if backup called on closed database
Attempting to backup a closed database will trigger segfault:
```python
import sqlite3
target = sqlite3.connect(':memory:')
source = sqlite3.connect(':memory:')
source.close()
source.backup(target)
```
(cherry picked from commit
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.. | ||
__init__.py | ||
backup.py | ||
dbapi.py | ||
dump.py | ||
factory.py | ||
hooks.py | ||
regression.py | ||
transactions.py | ||
types.py | ||
userfunctions.py |