Add test to validate <choose> tag's <otherwise> fallback when parameter is null

[ku1551]

Summary

This PR adds a unit test to ensure that <choose> with <when> conditions correctly falls back to <otherwise> when a parameter is missing or null.

Motivation

While MyBatis already appears to handle OGNL evaluation with missing parameters gracefully, there wasn't an explicit test to guarantee this behavior.

By adding this test, we can be more confident that:

• When name is not provided, the when condition fails safely.
• The otherwise clause executes as expected, producing AND status = 'ACTIVE'.

Details

• Added ChooseWhenTest under submitted.choosewhen to verify this edge case.
• Uses H2 in-memory database and CreateDB.sql for test setup.

Notes

I wanted to provide a clear test case that proves <choose> properly falls back to <otherwise>.
This improves test coverage and helps ensure future refactoring doesn't accidentally break this logic.

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Let me know if you'd like any adjustments!

[coveralls]

coverage: 87.299% (-0.009%) from 87.308%
when pulling ddc75d7 on ku1551:feature/choosewhen-test
into 05558e2 on mybatis:master.