♻️ Refactor `_CallbackHandler` to handle optional model instances

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Name	Status	Preview	Comments	Updated (UTC)
authx	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 11, 2024 8:57am

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.85%. Comparing base (57ec415) to head (c9a65b5). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #640 +/- ## ======================================= Coverage 96.85% 96.85% ======================================= Files 16 16 Lines 795 795 Branches 116 116 ======================================= Hits 770 770 Misses 19 19 Partials 6 6 ```

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