Gracefully handle nil returns in generic CacheResult

[rekby]

Summary

• ensure the generic CacheResult helper returns the zero value when the cached payload is nil
• add a regression test that verifies nil results stay cached and deserialize to typed nil values

Testing

• go test ./...

[github-actions]

API Changes

summary

Base version: v0.7.0 (latest)
Suggested version: v0.7.1

[Copilot]

Pull Request Overview

This PR fixes a nil pointer dereference issue in the generic CacheResult helper function. When a cached fixture returns nil, the function now properly returns the zero value of the generic type instead of panicking during type assertion.

• Added nil check before type assertion in CacheResult
• Returns zero value of generic type when cached result is nil
• Added regression test verifying nil results are cached and deserialize correctly

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
env_generic_sugar.go	Added nil check to return zero value before type assertion
env_generic_sugar_test.go	Added test case verifying nil results cache properly and return typed nil values

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