Removed throw Exception code that does not occur

[Tussle0410]

Description

When selecting QueryLookupStrategy using a switch statement with Enum-defined values, if null is passed, it defaults to CreateIfNotFoundQueryLookupStrategy, which means the switch statement's default case cannot occur. Therefore, I determined that the corresponding throw Exception would never be executed.

So, I removed the code that performs the throw Exception.

Changes

Removed the throw exception part in the default case of the switch statement.

[mp911de]

The enum comes from a different library and therefore, changes to the enum aren't directly coupled to the Spring Data JPA module. The exception is more of a safe-guard to fail when something unexpected will be passed in. Therefore, we want to keep the exception arrangement as-is.

[Tussle0410]

It seems I hadn't considered that it could serve as a safeguard against unexpected errors.
Thank you for providing such a good response with your opinion.