fix(permission-check): optimize batching and handle empty refs

Walkthrough

The changes introduce a conditional check in the SubjectPermission method of the SubjectPermissionEngine struct to handle cases where the refs slice is empty. When empty, the method returns an emptyResp response and a nil error, optimizing the execution path by preventing unnecessary processing. Additionally, a new test case is added to the test suite for the permission engine to validate its behavior when there are no relationships defined, enhancing test coverage for scenarios involving empty references.

Changes

File	Change Summary
internal/engines/subjectPermission.go	Added a conditional check in `SubjectPermission` method to return `emptyResp` if `refs` is empty.
internal/engines/subjectPermission_test.go	Introduced a new test case for handling empty references in the subject permission engine.

Poem

In the garden of code, where permissions play,
A check was added to brighten the day.
When refs are empty, a swift response flies,
No need for the goroutine, just clear, open skies.
With tests to ensure all is well in the land,
The engine now dances, perfectly planned! 🐇✨

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Permify / permify