🪲 BUG-#215: Fix StorageFile.get() returning empty list for missing keys

[FernandoCelmer]

Description

Fix StorageFile.get() returning Context(storage=[]) instead of Context() when a key does not exist. This broke resume=True — all tasks were silently skipped because [] is not None evaluates True.

Issue: 📌 ISSUE-#215

Changes

• Add early return Context() when task_context is empty in StorageFile.get()
• Aligns with the pattern already used by StorageS3 and StorageGCS

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes