Fix GH-9032: SQLite3 authorizer crashes on NULL values

The arguments 3 to 6 of the authorizer callback may be `NULL`[1], and
we have to properly deal with that. Instead of causing a seg

Fix GH-9032: SQLite3 authorizer crashes on NULL values

The arguments 3 to 6 of the authorizer callback may be `NULL`[1], and
we have to properly deal with that. Instead of causing a segfault, we
deny authorization, which is still better than a crash, and apparently,
we cannot do better anyway.

[1] <https://www.sqlite.org/c3ref/set_authorizer.html>

Closes GH-9040.

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