gh-142787: Fix assertion failure in sqlite3 blob slice

[Abdoulrasheed]

Fix assertion failure when slicing a sqlite3.Blob with indices that result in an empty slice.

• Issue: gh-142787

[erlend-aasland]

Thanks for working on this! Please make sure this regression is covered by the test suite.

[aisk]

Hi, there is a duplicated news entry, please remove it.

[erlend-aasland]

Moreover, please avoid force-pushing (as recommended by the devguide).

[Abdoulrasheed]

Moreover, please avoid force-pushing (as recommended by the devguide).

Noted @erlend-aasland