fix: set as default type for factory only if model is defined (Sourcery refactored)

[sourcery-ai]

Pull Request #479 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
will be closed automatically.

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Review changes via command line

To manually merge these changes, make sure you're on the set-as-default-factory-for-type branch, then run:

git fetch origin sourcery/set-as-default-factory-for-type
git merge --ff-only FETCH_HEAD
git reset HEAD^

Help us improve this pull request!

[sourcery-ai]

Function BaseFactory._infer_model_type refactored with the following changes:

• Lift code into else after jump in control flow (reintroduce-else)
• Replace if statement with if expression (assign-if-exp)

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/polyfactory-docs-preview/482